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NLee the Engineer RSS Feed (Nashua, NH)

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(6-Pack) Philips 452771 SlimStyle 13W A21 LED 2700K light Dimmable Bulb - 75w equivalent
(6-Pack) Philips 452771 SlimStyle 13W A21 LED 2700K light Dimmable Bulb - 75w equivalent
Offered by Rayvern Lighting Supply
Price: $59.94
2 used & new from $59.94

5.0 out of 5 stars A larger Lollipop Bulb with more light and less noise, August 21, 2016
I purchased this Philips SlimStyle 13W A21 LED 2700K Dimmable Bulb from my local HarDware store last year, because I needed something brighter than the typical 60W-equivalent 800 lumen LED bulbs. Previously I tried the LE 12W A60 E26 LED Light Bulbs which claims to be '75W-equivalent' with a light output of 1010 lm. But once the bulb heats up, it's light output drops to just '60W-equivalent'. This Philips SlimStyle A21 bulb, on the other hand, seems to give out a consistent 1100 lumens of light whether it is cold or warm.

[Physical Appearance]
The Philips Slim-Style A21 bulb is flat and shaped like a lollipop, just like the smaller A19 version (Philips 433227 10.5-watt Slim Style LED Bulb) which I reviewed two years ago. The bulb is covered by a thick, semi-translucence plastic which makes it feel rugged. The plastic is thermally conductive, to get the heat out of the flat heat sink in the center.

[Beam Pattern]
The actual light source consists of ~40 tiny LEDs, arranged around the edge of the lollipop. This gives a very uniform light distribution, close to omni-directional like a traditional incandescent bulb.

The color temperature is 2700K, which is similar to that of an incandescent bulb. So unless you can see the bulb directly, you cannot tell the difference between this LED bulb and a 75W incandescent bulb.

[Power Consumption]
According to my EUM-A1 Power Usage Meter (which has a resolution of 0.1W), the Philips bulb consumes 12.6W, initially. After ~30 minutes, the power remains nearly unchanged at 12.5W. After more than 1 hour, it settled at 12.3W. This is much better regulation compared to some other LED bulbs I have tested. (The LE 12W LED bulb, for example, dropped from 11.6W to 9.6W in just 30 minutes)

The power factor is consistently high at PF=0.88 - 0.89. This is usually a sign of good electric design.

[Dimming Performance]
I tested this Slim Style A21 13W bulb on a TRIAC-controlled light fixture, together with three other Philips LED bulbs:
- Philips 433227 10.5-watt Slim Style LED Bulb
- Philips 432732 11-watt A19 'Funnel' LED Bulb
- Philips 455576 60-Watt Equivalent A19 LED Light Bulb

As can be seen from the customer image I uploaded: both Slim Style bulbs show very limited dimming range, down to maybe 20% light at minimum power. However, there is one very important difference not shown in the picture: the old A19 Slim Style bulb gives out a loud buzzing sound when dimmed, while the new A21 bulb is almost inaudible.

In term of dimming range, the Philips 432732 11-watt Funnel LED Bulb is the clear winner. It dims all the way down to a faint glow.

The Philips 455576 60-Watt Equivalent A19 LED Light Bulb is clearly labeled as 'Non Dimmable'. But I put it through the test anyway, just because I'm an engineer. As it turns out, its performance is surprisingly good for a 'non dimmable' bulb.

I'm happy with the extra light output produced by this Philips Slim Style 75W-equivalent LED bulb. Its power consumption is well-regulated, which implies consistent brightness at hot. More importantly, Philips seems to have improved the mechanical construction to eliminate the buzzing sound when dimmed. As of right now, this is the lowest cost 75W-equivalent LED bulb made by a reputable company. That makes it an excellent value.
Comment Comment (1) | Permalink | Most recent comment: Aug 24, 2016 4:27 PM PDT

Combo: Tenergy TN156 4-Bay AA/AAA NiMH LCD Battery Charger + 3 Cards Centura AAA Batteries (12pcs)
Combo: Tenergy TN156 4-Bay AA/AAA NiMH LCD Battery Charger + 3 Cards Centura AAA Batteries (12pcs)
Offered by Battery Superstore
Price: $21.99

3.0 out of 5 stars Good batteries / Disappointing charger, August 18, 2016
This package contains the Tenergy TN156 4-Bay AA/AAA NiMH LCD Battery Charger, plus 12 Tenergy Centura AAA NiMH batteries

The Tenergy Centura AAA batteries are rated 800mAh. Actual measured capacity is ~12% higher according to my La Crosse BC1000:
- Right out of the package, the average remaining charge measured was only 237mAh, or 30% of the rated capacity of '800mAh'.
- After the first recharge, the average capacity jumped up to 898mAh!
- After another two discharge/recharge cycles, the average peaked at 900mAh.

In comparison, Sanyo eneloop AAA Pre-Charged batteries typically arrives with ~75% of rated capacity, and the average capacity after 2 cycles is 830-840mAh. So the Tenergy Centura actually delivered ~7% higher capacity than eneloop.

Long-term charge retention rate of Tenergy Centura AAA is also quite good:
- First pair was tested after 3 months of storage. The average remaining charge is 83.3% of original capacity
- Second pair was tested after 5 months. The average remaining charge is 81.2% of original capacity

The TN156 features an impressive-looking LCD panel that shows the status of each battery. However, each status bars does NOT represent the 'fullness' of each cell. It simply cycles from 0-bar to 3-bar as long as the charging process is going on.

For my first test, I put four fully depleted eneloop AA batteries in the TN156 overnight, then discharged them in my BT-C2000 Battery Charger Tester Analyzer. The average capacity I measured was just around 800mAh. Something must be wrong since the same 4 batteries, when charged using the BT-C2000, reported an average of 1950mAh.

Over the next few days, I tried several more times to recharge my batteries using the TN156. What I noticed is that the charge time is completely random. To recharge a 2000mAh battery at 500mA should take about 4 hours. But sometimes the LCD panel turns off after just 2 hours, while other times it goes on for 8 hours. Regardless of charge time, the batteries are consistently under-charged, with capacity readings from less than 200mAh to around 800mAh. That is just 10% to 40% of the full capacity. What good is a 'Smart' charger that can't even recharge my batteries to 50% full?

The Tenergy Centure AAA batteries are quite good, but the TN156 charger is completely useless. If you need an inexpensive charger which is actually Smart, I recommend getting the Panasonic BQ-CC17 instead.

TCP RLAO10W27K LED OMNI A19 - 60 Watt Equivalent (10w) Soft White (2700K) Dimmable Standard Light Bulb
TCP RLAO10W27K LED OMNI A19 - 60 Watt Equivalent (10w) Soft White (2700K) Dimmable Standard Light Bulb
Offered by My First Aid Company®
Price: $13.97
3 used & new from $7.99

3.0 out of 5 stars Low-cost Dimmable LED bulb with limited dimming range and poor power regulation, August 14, 2016
Verified Purchase(What's this?)
Bought this TCP 10W Dimmable LED A19 bulb from my local HarDware store, because it was the lowest-cost 60W-equivalent LED bulb marketed as 'Dimmable'. My actual test results, however, were disappointing.

[Power Consumption]
According to my EUM-A1 Power Usage Meter (which has a resolution of 0.1W), the TCP bulb consumes 10.2W initially. The power drops to 9.1W after ~30 minutes, then 8.5W after ~1hr. This corresponds to a 17% drop in power, which means its light output also drops to 700 lumens or lower (since light efficacy of LED is lower at hot). So it performs more like a '50W-equivalent' bulb when hot.

The thermal behavior of this TCP bulb is similar to that of the LE 12W A60 E26 LED Light Bulbs. The latter's power consumption also drops by 17% (from 11.6W to 9.6W) when the bulb warms up.

Other name-brand LED bulbs do exhibit some shift in power consumption, but typically just around 5%. For example, the Philips 11W A19 'Funnel' bulb consumes 11.3W initially, 11.1W when hot.

[Dimming Performance]
I wonder how TCP is able to market this LED bulb as 'Dimmable'. Refer to the picture I uploaded, and you can see that the TCP bulb has a very limited dimming range. Its brightness drops to ~40% at the minimum power setting of my TRIAC-controlled light fixture. In comparison:

- The Philips 8.5W A19 LED Light Bulb (which is marketed as 'Non-Dimmable') gives similar dimming range down to ~40%
- The Philips 11W Dimmable 'Funnel' bulb dims down to ~5%
- The incandescent bulb dimmed all the way down to probably ~1%.

When dimmed, the TCP bulb emits a 120Hz humming noise that can be heard from ~1 ft away. It is not as quiet as the Philips 11W 'funnel' bulb, but much better than the Cree 9.5-Watt Soft White LED Light Bulb (aka 'Black-Eyed Susan').

The TCP 10W 'Dimmable' LED bulb has a very limited dimming range. It suffers from poor power regulation and cannot maintain its light output at hot. I recommend the following alternatives instead:

- If you can accept the narrow dimming range, get the Philips 8.5W A19 LED Light Bulb at even lower cost.

- If you need a wider dimming range and are willing to pay more, get the Philips 11W A19 'Funnel' bulb.
Comment Comment | Permalink

Egoway® HP VK04, 695192-001, 694864-851, H4Q45AA, HSTNN-YB4D Laptop Battery for Pavilion 14-B, Sleekbook 14, Sleekbook 15, TouchSmart 14, TouchSmart 15 Series [Li-ion 14.4V 2600mAh]
Egoway® HP VK04, 695192-001, 694864-851, H4Q45AA, HSTNN-YB4D Laptop Battery for Pavilion 14-B, Sleekbook 14, Sleekbook 15, TouchSmart 14, TouchSmart 15 Series [Li-ion 14.4V 2600mAh]
Offered by EGOWAY
Price: $19.99

1 of 1 people found the following review helpful
5.0 out of 5 stars I'm glad I gave Egoway 'BATTRY' a try, August 10, 2016
Verified Purchase(What's this?)
The original battery pack in my 2013 HP laptop has deteriorated badly, to the point it can hardly run for 30 minutes. There were many replacement battery options found when I searched for 'HP VK04' on Amazon. I decided to try this Egoway HP VK04 battery pack mainly because it is half the cost of OEM battery. It is rated 14.4V 2600mAh for a total energy of 37.4Wh, nearly identical to the 37Wh rating of OEM battery. In contrast, many of the lower-cost battery packs are rated 2200mAh, which yield 31.7Wh only.

The battery pack arrived in a brown paper box that says "Professional Laptop Battry" outside (as shown in my uploaded picture). According to 'Urban Dictionary' web site, BATTRY is West Indian Slang for two men having sex with a woman at the same time. Thanks a lot for filling my mind with dirty thoughts!

Mechanically, the product looks well-made and almost indistinguishable from the OEM battery. It snaps into my laptop with a perfect fit. The battery pack came with 49% charge according to my laptop's battery status meter. Once the battery was fully charged and with the AC adapter unplugged, my laptop reports remaining runtime of 3 hours 55 minutes. This sounds about right.

So far after nearly 3 months of daily use, the battery pack is still giving a consistent runtime of around 3 hour 50 minute. So I'm very happy with my purchase.

I was going to deduct one star for misspelling 'BATTERY' on the box. But then I realized I can't survive without a spell-checker myself. So I have no excuse but to give this product a 5-star rating (something about people in glass houses and stones). I will update the rating in case any problem pops up in the near future.
Comment Comment | Permalink

BPI 8 Pcs 1.6v 1000mWH High Voltage Rechargeable AAA NIZN Battery Batteries + Original LED AA/AAA NI-ZN Charger
BPI 8 Pcs 1.6v 1000mWH High Voltage Rechargeable AAA NIZN Battery Batteries + Original LED AA/AAA NI-ZN Charger

1 of 1 people found the following review helpful
3.0 out of 5 stars What you need to know about High Voltage NiZn batteries, August 8, 2016
Verified Purchase(What's this?)
This package (BPI 1.6v 1000mWh Rechargeable AAA NiZn Battery Batteries + Original NiZn Charger) contains eight 'High Voltage' NiZn AAA cells, plus a dedicated NiZn charger. At the risk of restating the obvious: You cannot recharge NiZn cells in ordinary chargers designed for NiMH/NiCd cells, nor can you recharge ordinary NiMH/NiCd cells in this NiZn charger.

The 'BPI Original' NiZn charger looks suspiciously like the old PowerGenix 1 Hour Quick Charger (see the picture I uploaded to 'Customer Images' section for comparison). For AA cells, the BPI unit has lower charging current and hence longer charge time. But for AAA cells, the two units actually have nearly the same charge time of about 1 hour. Note that even after the red indicator light turns off, it is best to leave the cells in the charger for another 2-3 hours. This is needed for the trickle charge current to top-off the cells to 100%.

The BPI AAA cells are marketed as "33% higher energy density' and are rated as '1000mWh' (milli-WATT-hour). Most people may confuse this with '1000mAh' (milli-Ampere-hour). But in fact its charge capacity is only 600mAh or less (I measured 550mAh using my La Crosse BC1000). So the ENERGY stored in each '1000mWh' NiZn cell is actually the same as that in a 800mAh NiMH cell such as Sanyo eneloop AAA. What the NiZn cells really offer is 33% higher VOLTAGE than NiMH cells.

Energy = Power * Time = Voltage * Current * Time
Operating voltage of NiZn cell = 1.65V, so Energy = 1.65V * 600mAh = 1000mWh
Operating voltage of NiMH cell = 1.25V, so Energy = 1.25V * 800mAh = 1000mWh

[Voltage Matters]
The 33% higher voltage of NiZn cells could be a benefit for devices that are "low-voltage intolerant". For example, some wireless transmitters only work well with fresh alkaline or lithium (1.6V) cells, so they will show 'low battery' when you try to use NiMH (1.25V) cells in them.

On the other hand, with higher voltage comes higher risk. When those NiZn cells are freshly charged, they show a terminal voltage of 1.8-1.85V per cell. When you put those cells in an unregulated appliance, the higher voltage could cause power consumption to increase out of control, and burn out the appliance.

[Deep Discharge]
One must take care to never drain those NiZn cells to below 0.5V, or else they will be permanently damaged. But this is almost unavoidable when you use 3-4 NiZn cells in series, since even when one cell is completely exhausted, the other cells may still have enough combined voltage to power the appliance. In contrast, NiMH cells are more robust and can be drained down to 0V without permanent damage.

[Self Discharge Rate]
I have tested one pair of NiZn AAA cells after three months of storage. They retained 80% of their original charge (438mAh/546mAh). This is better than that of ordinary NiMH cells, but not as good as low-self-discharge type such as Sanyo eneloop.

[Bottom Line]
The higher voltage of NiiZn batteries can offer some advantages in appliances such as motorized toothbrush. But beware that the excessive voltage can also cause damages. In particular, you should NEVER use those NiZn cells in 3xAAA LED flashlights (such as the Rayovac DIY3AAA-B Indestructible 3 AAA Flashlight), since most of them are unregulated, and rely on the internal resistance of alkaline cells to limit the LED current. When you put in three freshly charged NiZn cells, the higher voltage combined with lower internal resistance will cause LED current to increase exponentially. That is one sure way to kill your LED flashlight.

When used in electronic devices with regulated input power (such as a MP3 players), those NiZn cells will function similar to lower-voltage NiMH cells. But you'll not get longer run time since the ENERGY stored in each NiZn cell is the same as that in NiMH cell.
Comment Comment | Permalink

Kastar AA (4-Pack) Ni-MH 2700mAh Super High-Capacity Rechargeable Batteries Pre-charged
Kastar AA (4-Pack) Ni-MH 2700mAh Super High-Capacity Rechargeable Batteries Pre-charged

1 of 1 people found the following review helpful
2.0 out of 5 stars Measured capacity is up to spec, but NOT Low Self-Discharge type, August 5, 2016
I bought a set of four KASTAR AA Ni-MH Rechargeable Batteries back in Jan 2016, because they claim to be 'Pre-Charged' with usually high capacity of '2700mAh'. In contrast, all name brand pre-charged batteries I have tested only offer capacity up to ~2500mAh.

Upon arrival, I inserted those batteries in my La Crosse BC1000 Battery Charger for a quick check. Three out of four cells show initial voltage of 1.28V, which is a good sign. However, the 4th cell shows only 1.15V, which means it is nearly exhausted. Well, so much for the claim of "Pre-charged" and "holds 75% power after 3 years".

[Capacity Testing]
Next, I put those cells through Discharge/Refresh operation on the BC1000. Here are my results:
Round 1: Cell#1-3 show 2070 - 2160mAH (Good), but cell#4 just 276mAh (Bad)
Round 2: average capacity jumped to 2677mAh
Round 3: average capacity = 2685 mAh

Round 7: final capacity = 2737.5 mAh (2650 - 2840mAh)

The above progress looks suspiciously similar to that of EBL High Capacity 2800mAh AA Ni-MH Pre-charged Rechargeable Batteries I tested more than a year ago. But I noticed there are some mechanical differences between positive/negative terminals of EBL and KASTAR batteries, so they were probably not made in the same factory.

[Self-Discharge Rate]
- The first pair of KASTAR AA cells was tested after 90 days in storage. The average remaining charge is 2190mAh (2220, 2160), or 80% of the original capacity.
- The second pair was tested after 6 months. One cell shows 1652mAh of remaining charge, which is 60% of its original capacity. The other cell is completely DEAD!

So those KASTAR batteries are as bad as EBL batteries when it comes to charge retention rates. They are simply not in the same league as name-brand LSD batteries such as Panasonic eneloop.

Both KASTAR and EBL product description pages make identical claims of "Low self-discharge... holds 75% power after 3 years" and "extend lifespan up to 1200 cycles". It sounds like those claims were simply copied from the same source without any supporting data.

[Bottom Line]
My test results show that KASTAR batteries do meet the '2700mAh' capacity rating. However, they are NOT 'low self-discharge' as advertised, and their quality control appears to be poor. If you just need high-capacity regular NiMH batteries, they may be still worth considering. Otherwise, stick with proven name brands such as eneloop PRO and AmazonBasics High-Capacity Pre-Charged.

Victorinox Jetsetter 3 Pocket Knife
Victorinox Jetsetter 3 Pocket Knife
Price: $17.50
13 used & new from $14.95

4 of 4 people found the following review helpful
3.0 out of 5 stars Failed to serve its primary purpose, July 31, 2016
Verified Purchase(What's this?)
I have been carrying a Victorinox Swiss Army Classic Pocket Knife with my keys for the past 20+ years. But recently I lost three of those during domestic and international flights, due to either my own negligence or over-zealous airport security officers. That's why I purchased this item (Victorinox Jetsetter 3 Pocket Knife), because the product description claims it "has no blades & passes safely through TSA".

The Jetsetter looks very similar to the Classic pocket knife (see the comparison photo I uploaded), except it is a 'bladeless knife'. Also note that it is missing the finger nail file. The tools it added include a bottle opener and Phillips head screw driver. The main common tool between the two products is the tiny scissors which I use often. So I feel that the Jetsetter is still a good compromise.

During my first international flight from Boston to Shenzhen, the Jetsetter passed TSA checkpoint without incidents. Unfortunately, it was flagged during my return flight from Shanghai back to Boston. I quickly pointed out to the security officer that this is a 'bladeless knife'. But according to the officer, even tiny scissors are not allowed on international flights. So there goes my Jetsetter.

[Bottom Line]
The Jetsetter may be a good tool to carry for people who only travel domestically. But to international travelers this product is useless, since it will get confiscated anyway. It was a waste of money for me and I cannot recommend it.
Comment Comments (3) | Permalink | Most recent comment: Aug 5, 2016 2:28 PM PDT

BT-168D Digital Battery Tester Volt Checker for AA AAA C D 1.5V 9V Mini Cell Batteries
BT-168D Digital Battery Tester Volt Checker for AA AAA C D 1.5V 9V Mini Cell Batteries
Offered by e-smart home
Price: $16.99

2 of 2 people found the following review helpful
4.0 out of 5 stars Simple and effective tester for both alkaline and NiMH batteries, July 28, 2016
Verified Purchase(What's this?)
A traditional inexpensive battery tester consists of an analog meter with Red/Yellow/Green zones. If the needle moves into the Green zone, the battery is said to be 'Good'. If the needle stays in the Red zone, the battery is considered 'Bad'. One problem is that since the tester is calibrated for alkaline batteries, it does not work correctly for rechargeable NiMH or NiCd batteries. Even a fully charged NiMH battery will end up in Red or Yellow zone, because it has a lower operating voltage than alkaline battery.

- A fresh alkaline battery has a voltage reading close to 1.6V. The battery voltage drops linearly with usage. By the time it drops below 1.3V, the battery is about 50% exhausted.
- A freshly charged NiMH battery starts from around 1.35V. During operation, its voltage remains fairly constant at around 1.2V, until the battery is nearly exhausted, and then the voltage falls off rapidly.

This product (BT-168D Digital Battery Tester), however, has a digital readout for battery voltage. Based on the voltage reading and the battery type, the user can make an informed decision on the battery status.

For example, if you put a NiMH battery in this tester and it shows over 1.25V, the battery is fully charged. If it shows less than 1.20V, the battery is nearly exhausted. The difference between 'full' and 'empty' is just 0.05V, which is why traditional battery testers are useless in reporting the status of rechargeable batteries.

One important note: This tester draws a small load current (~40mA) from the battery being tested. If you measure your battery’s open-loop voltage using a DMM (digital multimeter), the reading is typically higher than that shown on this tester. This is normal because alkaline cell has higher internal resistance, so its voltage dips when under load.

On the other hand, since this battery tester is an extremely cheap piece of equipment, you can’t expect it to give super accurate results. I have double-checked the accuracy of my BT-168D against a professional digital multimeter (Agilent 34401A) connected in parallel. As can be seen in the uploaded chart, my BT-168D's reading is very accurate around 1.5V. But at lower voltage the error increases. For example, at 1.2V actual voltage, the battery meter shows 1.1V instead. As long as you are using the same battery meter to measure different batteries, you can still get a consistent indication on battery status.

[Bottom Line]
At the present low price of this product, I consider it an excellent value. It is especially useful for people with basic knowledge on different battery types and their nominal voltages.

[Additional Notes]
- The product description says "Can quickly test the capacity of your battery". This is wrong. The voltage reading only represents the 'fullness' of the battery, not its actual capacity (mAh).
- The unit has no internal battery. It is powered by the battery being tested.
- If the battery being tested is completely dead (below 0.5V), the meter will not power up.
- If you search for "BT-168D" on Amazon, you’ll see multiple testers show up under different brand names. They are all the same product so just choose by price.
Comment Comment | Permalink

Sony 32GB High Performance Class 10 UHS-1/U3 SDHC up to 95MB/s Memory Card (SF32UZ/TQN)
Sony 32GB High Performance Class 10 UHS-1/U3 SDHC up to 95MB/s Memory Card (SF32UZ/TQN)
Price: $19.79
9 used & new from $17.62

2 of 2 people found the following review helpful
3.0 out of 5 stars Writes slightly slower than advertised / Not the best value among Sony cards, July 24, 2016
Verified Purchase(What's this?)
I purchased this Sony UHS-1 U3 32GB SDHC card (SF-32UZ) at the same time with the Sony UHS-1 U3 32GB SDHC (SF-32UX2). The 'UZ' card is priced higher and advertise a faster speed of "95MB/s Read; 90MB/s Write', while the 'UX2' card advertises "94MB/s Read; 70MB/s Write". So I was curious to see how much faster the UZ is compared to the UX2.

Short answer: it doesn't

I used a program called 'CrystalDiskMark 3.0.1 x64' to measure, among other things, the Sequential Read and Write speed of both cards. The card reader I used is the Transcend USB 3.0 Card Reader (TS-RDF5K), connected to an USB 3.0 port. My measured results are:

UZ: Sequential Read=92.1MB/s; Write=77.1MB/s (advertised 90MB/s)
UX2: Sequential Read=93.1MB/s; Write=85.9MB/s (advertised 70MB/s)

Note that the measured Write speed of the cheaper UX2 card is actually 11% faster than the UZ. This came as a surprise so I repeated the test on a different computer, but received essentially identical outcome.
(See the chart I uploaded for speed comparison between various SD cards)

[Bottom Line]
In terms of Sequential Write speed, this Sony 'UZ' card performed slightly below advertised. This is usually not a big deal, except that Sony also sells the UX2 series which costs ~20% less, and runs 11% faster. Therefore I highly recommend getting the UX2 series instead.

[Other Remarks]
- This card is made in Taiwan, same as all other Sony cards I own.

- Capacity of this '32GB' card, as reported by my computer, is 29.8GB. On the back of the package it actually says: "Approximately 28.8GB available". It is always better to see manufacturers promise less but deliver more, rather than the other way around.
Comment Comments (2) | Permalink | Most recent comment: Aug 1, 2016 6:36 AM PDT

Charger with Two 14500 Rechargable Batteries
Charger with Two 14500 Rechargable Batteries
Offered by Smartlive
Price: $7.39
13 used & new from $7.39

12 of 13 people found the following review helpful
2.0 out of 5 stars UltraFire batteries never fail to disappoint, July 21, 2016
Verified Purchase(What's this?)
I received this Charger with two UltraFire 14500 Li-Ion Batteries as part of a previous purchase (MECO Mini CREE Led Flashlight Torch Zoom Light Charger 14500 Battery). This review focuses on the charger and batteries only.

[Battery Charger]
The unbranded charger accepts 100-240V universal AC voltage. It has a single LED indicator: Red when charging, Green when done. A faint ringing sound can be heard whenever the charger is plugged in.

In standby mode, the charger consumes 0.3 watt according to my EUM-A1 Power Usage Meter. When charging either one or two 14500 cells, the charger consumes 2.7W. This suggests the charging current is around 500-600mA total, shared between two cells. On the charger it says: "Output: DC 4.2V 600mAh" which is the wrong unit ('mAh' is the unit for capacity, not current).

The two 14500 Li-ion batteries I received are labeled 'UltraFire 1200mAh'. I connected a 5-ohm power resistor as load, and monitored the battery’s output current and voltage over time. I expect each battery to provide around 700mA for at least 1.5 hours. Instead, they both dropped dead after approximately 30 minute. Something is very wrong.

I repeated my test after recharging those two batteries overnight. But the outcome is still the same. See the “Output Current vs. Time” chart I uploaded to customer images section. The batteries’ actual measured capacities are 310 and 420mAh, respectively. That means they can only deliver 1/4 to 1/3 of their advertised capacity. The large discrepancy between those two batteries is also an indication on poor quality control.

Previously I have tested some UltraFire AA 3500mAh 1.2V NiMH Rechargeable Batteries. Their average measured capacity is only around 500mAh, or 1/7 of advertised value. Similarly, the UltraFire AAA 1500mAh 1.2V NiMH measured just 259mAh, or 1/6 of advertised capacity.

[Bottom Line]
All the UltraFire rechargeable batteries I have tested (AA, AAA, 14500) deliver only a fraction of their rated capacities. This manufacturer is simply using false advertisement to prey on unsuspecting customers. Don’t waste your money on this or any other UltraFire products.
Comment Comments (4) | Permalink | Most recent comment: Aug 16, 2016 8:51 PM PDT

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