18650 Battery Charger,Miboxer 4 Bay Smart Universal Intelligent Battery Charger for NiMH NiCd A AA AAA Li-ion LiFePO4 IMR 10440 14500 16340 18650 RCR123 26650 21700 Batteries Charger
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- Universal Battery Charger: Compatible rechargeable batteries IMR/Li-ion(4.2V/4.35V)/LiFePO4(3.6V)10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14350, 14430, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650,17670,18350,18490,18500,18650,18700,20700,21700,22500,22650,25500,26500,26650 Ni-MH / Ni-Cd (1.48V) A AA AAA C SC
- Charging safety: 18650 battery charger, with high-precision digital calibration, safe fireproof PC + ABS material battery charger, with heat resistance, low temperature resistance and scratch resistance;
- Smart Charging: The AAA Universal Smart Battery Charger can detect different types of rechargeable batteries and can set the current and voltage of each channel. Reverse protection, precision end - charge voltage detection, overcharge timeout protection.
- High-definition LED display: Large LCD display shows voltage, current, charging time, mode, battery type, internal resistance, battery capacity data, and omnidirectional display of charge status per slot.
- Durability: surface treatment matte process, high elastic negative polarity Each slot has high-precision sliding polarity bracket, easy to move, effective anti-corrosion, anti-oxidation, durable; long-term use will not be biased.
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MiBoxer has accumulated rich experience in the research and development, design, logistics, production, operation and management of smart chargers, forming an efficient R&D management team. As an innovative technology company, we have a vigorous, high-quality, young and professional R&D team to provide continuous vitality and motivation for the company's vigorous development. We have established the Shenzhen Rechargeable Battery Research Center together with the Shenzhen Municipal Government. ", 5 comprehensive laboratories, obtained more than 100 research and development patents.
We will always maintain the service spirit of “ubiquitous listening” customers and consumers, and provide consumers with leading products and sincere and efficient services.
MiBoxer intelligent multi-function charger, which is compatible with almost all common rechargeable lithium-ion and nickel-metal hydride batteries, adopts microcomputer chip control, automatically recognizes the rechargeable battery category, and selects the corresponding mode to charge it. Four charging slots are independently controlled and mutually Without affecting, four different types of batteries can be charged at the same time. The LCD above the charging slot displays the battery voltage and battery power in real time, so that the battery can be charged at a glance, using fast charging technology.
Universal Battery Charger
Compatible rechargeable batteries IMR/Li-ion(4.2V/4.35V)/LiFePO4(3.6V)
Ni-MH / Ni-Cd (1.48V) A AA AAA C SC
MiBOXER C4Plus Smart Charger has multiple security settings, and the charger prevents battery reverse, short circuit, overcharge, and overcurrent damage, leaving you with no security concerns. The charger automatically adapts to the most suitable small current current according to the characteristics of the small capacity battery. Safe and efficient charging, maximizing battery life.
Miboxer smart battery charger for rechargeable household appliances or electronic rechargeable batteries. For example: TV remote control, wireless mouse, children's toys, microphone, drone, flashlight and other rechargeable batteries for charging. The Miboxer battery charger makes everyday life easier, safer and smarter.
Basic Product Info
Input:AC100-240V 50/60Hz 0.5A(Max)30W
Output Voltge:4.2V±1% / 4.35V±/1% / 3.6V±1% / 1.48V±1%
Output Current:Li-ion/LiFePO4(2.5A*2Max / 2A*3 / 1.5A*4)
Ni-mh / Ni-Cd(1A*4Max)
Save over-discharged lithium batteries.
It has an activation function for lithium batteries with protection circuits.
It has a repair function for lithium batteries that have been placed over 0V, thus improving battery life.
Operation display function:
LED display: display the charging data, current, voltage and charge of each slot.
Electrical charging current and voltage can be designed. Make charging safer.
The Miboxer Smart Universal Battery Charger is easy to operate. (Please read the product manual before use)
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Top reviews from the United States
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The undocumented item I don't consider a problem, just wanted to make note of it. Pressing the Slot button will only change to the next slot if the back light is already on. If the light is off, pressing Slot only turns on the back light. The button must be pressed again to change to the next slot.
Now the oddity...
When charging four NiMH batteries, the battery loaded in the last slot will charge VERY SLOWLY. It will eventually charge to full capacity but it will take significantly longer than the other three batteries. I have tested this loading four batteries varying the final slot - that final slot will be slow. For example, I have loaded C1, C2, C3, C4 - this causes C4 to be the slow slot. I have also loaded C4, C3, C2, C1 - this causes C1 to be the slow slot. I don't know if this will also happen with other battery types. I don't know what happens if I load less than four batteries.
I have tried increasing the charging current on the final slot but it does not make a difference. It will still charge the slowest. When the other batteries are done, if I move the battery from the slowest slot to another slot, it will charge faster.
I have used several other charges through the years and I've never had one exhibit this behavior before.
1) ability to read internal resistance on all slots
2) ability to do a full discharge/recharge cycle in slot 4
3) solid design
4) regular AC power cable instead of external transformer
5) can do LiFePO batteries at 3.2 v
6) backlight goes off or you can turn it off manually.
1) no car adapter included. You have to buy it separately: Miboxer smart car charger 5v/12v two voltage outputs 2.0A USB power cord suitable with Car/SUV/Trucks/charging fast for Iphone 8,Samsung etc
2) can ONLY do a full capacity test in slot 4
3) Difficult to grab and remove batteries. Why not undercut slots 1 and 4 from the sides and have divits between slots 1-2 and 3-4 so you can slip your finger in?
4) were they paying for extra buttons? This thing has two buttons ONLY and most of the controls are through short or long presses of the second button only. Would it hurt to have more buttons?
5) the instructions were utterly useless. I had to figure it out by trial and error. The programming language for this is Morse code. Seriously, it's a series of long and short pulses. But, instead of giving you the ACTUAL codes in the instruction manual, we get Chinenglish gibberish. Just give me a chart: to do this, press this series of dots and dashes.
6) did I mention that it didn't include a car charger?
Update: June 2018
- Okay, this thing will charge CR2 batteries, but you need a spacer. I used spent .32 ACP cartridges, but I suppose you can stack a few coins at the top and it would work. I have to use LiFePo4 batteries for three of my devices that don't like the 3.7v batteries.
I like the display a lot and the build quality is very good. Overall the user interface is very easy to understand. Something that threw me at first but seems obvious now is that the mAh are listed in the instructions as Battery Capacity but it is really more like Charge Accepted or something like that. A very minor nit is that I wish the AAA battery holder had a storage place somewhere on the charger so I didn’t have to worry about losing it. The grip on the battery is very secure but I do wish the end of the tray was open so I could pull the slide back more easily and not use the battery to move it.
These are all very minor issues. Charging Li-ion batteries is serious business and I really love the feedback and information this charger supplies. And I appreciate the safeguards claimed in the design. Good charger.
Included in the Box:
Charger, DC 12V/2A power supply and user manual.
The Miboxer C2 4000 is a two-slot cell charger that is compatible with all cell sizes including D cells. This charger supports NiCd, NiMH, Li-Ion and LiFePO4 type cells. It is not compatible with rectangular shaped 9V cells. It is essentially a C2 3000 with the addition of discharge features and manual current control.
Heat dissipation vents are located on the bottom and the rear of the unit. Additionally, a cooling fan is installed on the rear of the unit which is designed to augment cooling of both the unit and cells during the discharge process. The fan itself is very effective in keeping the unit and cells cool, but is quite loud. All things considered, it's a better fan than the one found in the Opus series of chargers, and has a considerably stronger airflow.
A temperature sensor is also included, but can only be monitored when a slot is discharging a cell. Oddly, the manual states that the unit will shut itself down when it reaches 90C(!) but the warmest I have seen the unit run is 44C when charging two D cells at 1A. Once I put these into discharge mode, the unit cooled down considerably to the mid-30's. So while the unit stays quite cool when operating normally, be weary that the safety shutdown feature does not occur until the unit is almost at boiling point. Having stated this - The temperature can be easily monitored during the discharge process, and the fan is powerful enough that it probably isn't necessary to worry about - UNLESS it starts malfunctioning.
Like the C4 model I already own, the C2 4000 appears to be constructed of flame retardant high impact plastic, and the venting/cooling should be adequate for preventing warping and/or discoloration of the case.
One thing I did notice about this charger's slot is that C and D cells have a tendency to shift some vertically when inserted, and you should pay closer attention to seat them correctly. Why? If you don't, you may have a cell pop out of the slot and go flying (and yes, this happened with a D cell!). Admittedly this was mostly my fault for not paying attention when inserting the cell, but this is the first charger I have encountered vertical shifting in (up to this point any shifting that occurred in other chargers was all horizontal so all that happened is they shifted a little sideways instead of shifting upwards and then jumping out when I slid the unit to another spot on the table). Not a big deal, but be weary that larger cells will shift in a direction that it becomes possible for them to pop out of the charger if not secured in the slot 100%.
The Miboxer C2 4000 has a white backlit LCD display that shows all the information on the current slot selected. There are two globally displayed battery icons that show whether the slot is charging/discharging or idle. When it is active, a universal electrical symbol icon will be displayed inside the battery icon. When the slot is inactive or unoccupied, nothing is displayed inside the battery icon. The battery percentage for both slots is also globally displayed.
A selected slot will display additional information on a cell:
Constantly displayed: Remaining time or time elapsed, mAh count, and cell type.
The numeric display in the lower right-hand corner will also scroll between battery resistance, voltage, charge rate and temperature (temperature is only displayed during the discharge process).
When a cell is fully charged, the mAh display will alternate between "FULL" and the total mAh accumulation; the battery percentage will also show "0%".
As with the C4, the C2 4000 has the same two yellow buttons for user operation, however, they behave somewhat differently.
The Slot button:
A quick press will toggle between slot 1 and slot 2.
A long press will make the mAh display start flashing and will give the user two more options:
1. Quick pressing the Slot button will toggle between Li-Ion 4.20V, Li-Ion 4.35V and LiFePO4 cell types (this is not available when the unit detects a NiCd/NiMH cell). Quick pressing the Mode button selects the type (please note this is only necessary if a Li-Ion 4.35V or a LiFePO4 cell has been inserted in the slot).
2. Quick pressing the Mode button will allow the user to toggle between charge mode and test mode (charge/discharge/charge).
The Mode Button:
Quick pressing the mode button will allow the user to manually select the current (or put it back into auto current). Quick pressing the mode button will toggle between the available preset currents:
Li-Ion/LiFePO4: 0.20A / 0.30A / 0.50A / 0.80A / 1.00A / 1.50A / Auto
NiCd/NiMH: 0.10A / 0.20A / 0.30A / 0.50A / 0.80A / 1.00A / Auto
Discharging rates (global):
0.20A / 0.30A / 0.50A / 0.80A / 1.00A / 1.5A / Auto
Auto current mode will show a flickering "A" to the right of the current value in use.
Once the desired current rate is selected, the unit will switch to that rate in a few seconds.
The C2 4000 works much like the C2 3000 when set into auto mode. Both slots are completely independent and any combination cell type/size can be used in this charger. When a cell is first inserted into a slot it will first check the internal resistance and then select what it thinks to be the appropriate current for the cell should be.
It appears that this is determined based on both the internal resistance and the maximum capacity of the cell. A manual setting will make the unit charge the cell at the current of your choice.
In both auto and manual modes, the charging will start at a trickle rate and then ramp up quickly to the predetermined/selected current. Subsequently, when close to being full the current will gradually ramp down, regardless of whether the slot is in auto or manual mode. Unlike my C4, the C2 4000 does ramp down NiCd/NiMH cells when close to being full - I was happy to see that.
In auto mode, the current usually varies somewhat during the entire process and a manually set rate will stay at that fixed current until ramp down.
Finally, if the auto rate is not to your liking, it can easily be changed to a fixed current of your choice on the fly by performing the keystrokes to change the current as stated above.
The C2 4000 also can store two charge curve memories for Li-Ion 4.2V cells. Basically what it does is if a cell with a 3.4V or less is charged up fully it will remember the charging curve of the cell. I would call this a novelty feature since there are so few curve memories available. In reality it would only be useful if the user only has the same two cells that are discharged completely each time they are mounted into the charger. Even if this was the case, many devices (such as vaping mods) will quit functioning properly long before a cell reaches 3.4V. The three mods I use will stop working at about 3.57 volts - which would render this curve feature useless, to say nothing of the fact that I rotate six 18650's this setup. In short - I don't know whether this feature truly works or not, and honestly, it really doesn't matter.
While I find the ramp up and ramp downs to be superior to the capabilities of the C4, sometimes the current the C2 4000 selects for cells in auto is somewhat hit and miss. Generally, I found that sometimes the auto current would be close to what I would select for charging and discharging and other times it was way too high for my personal tastes, especially on 4.2V Li-Ion cells. I can only conclude that some will like the way the the auto mode logic works and others won't (I fall into the latter group). But since I use manual current settings most of the time anyway, this is a non-issue. Also, the auto rates will not simply bounce between the preset rates for manual charging but vary as the charge progresses. Sometimes I would see figures like 0.25A, 0.75A, 1.05A, etc. I would say that the charger's auto current selection seems to be directly influenced by the resistance measurements as it often changes when the resistance reading does.
Unfortunately, this factor brings me to the lone gripe in this review - this charger came with a problem right out of the box, albeit a minor issue.
I noticed that while slot 1 detected internal resistance on my Li-Ion 18650's just fine, it was having a lot of trouble detecting the resistances for virtually all of my NiMH cells. I was getting crazy readings like 001, 005, or even 999 milliohms (even in brand new cells) and as a result the NiMH cells would never charge above 100mA in auto mode, and sometimes it was as low as 10mA (read as 0.01A) It never reported an error on any of the cells, however.
This wasn't happening on a particular brand or cell size, but on every NiMH cell I tried regardless. Slot 2 on the other hand had no problem reading the internal resistance on any of these cells, so I can only assume that the unit I got has a problem on Slot 1 (sensor issues perhaps?). Occasionally it would read the resistance correctly after a few minutes (and read it correctly for the remainder of the charge cycle), and it seems to be able to always pick up the correct resistance when the charge was complete.
Fortunately, when using a manual current setting in Slot 1, the NiMH cells charged at the correct rate and I had no problems charging (or discharging) these cells, and the mAh counts versus time elapsed were pretty accurate. Since I prefer use fixed currents (especially for NiMH cells) anyway, it's not worth me worrying about it - as long as the issue doesn't get worse.
9/23/2017 Update: In the last couple of days it seems as this issue has resolved itself - Slot 1 now appears to be able to pick up the internal resistance on NiMH cells when inserted and monitor it correctly during the charge/discharge process, at least on AA cells anyway. Assuming this is also true of other size NiMH cells and the resistances continue to read correctly, I will change the product's rating from 4 stars to 5.
Lastly, it appears that this charger is just as accurate as my C4 about cutting off the charge at the proper voltage. For example right after I charged an 18650 cell to 4.20V, I measured the voltage on my multimeter and got a reading of 4.18V. This is pretty close, and in the real world this difference really does not matter.
This is the mode used for conditioning/breaking in cells. It works the same way that the C4 does - it charges it up to full (if necessary), discharges to empty and then charges the cell back up again to full. The behavior of the discharge on the C2 4000 is different (and superior to the C4) - unlike the C4 discharging from a simple hi/lo current (200mA and 400mA respectively) with no ramp down at all, the C2 4000 works exactly the same as it does in charge mode, and the user has a comprehensive set of current options to discharge at (even auto mode). There is also a gradual ramp down when the cell is close to empty - as there should be.
Curiously, on NiCd/NiMH cells one can only charge at a maximum of 1 amp but can discharge up to a current of 1.5 amps. This had me scratching my head a little as to why Miboxer did this, but the logic has to be that since the cooling fan only runs in the discharge cycle that they figured they could allow this - NiMH cells tend to get warmer than Li-Ion cells, so it makes sense that the charge rate was capped to 1 amp since the fan does not run in charging mode. I honestly don't know if I'd want to discharge any type of cell higher than 1 amp anyway - yes it works fine for higher capacity cells, but it likely will shorten the life of a cell if one charges or discharges at too high of a rate. There is plenty of argument of what the maximum "safe" current is out there already - I will just say that I tend to be conservative about how much current I put through a cell.
Speaking of resistance readings, what the C2 4000 was reporting (notwithstanding slot 1's issues with NiMH cells) was consistent with what my C4 reports - I would have to say that the accuracy is somewhat better as the readings did not vary as much between measurements. In short, while not exact on, the unit gives a pretty good ballpark figure of the condition of the cell inserted.
I wasn't that thrilled about finding a wall wart DC adapter in the box, but it's relatively small and provides enough wattage for this two-slot charger. Its output is rated at 12V and 2 amps - essentially providing 24 watts - which I doubt this charger would ever come close to needing since it only would be drawing a nominal load of 12.6 watts with a pair of 18650 4.2V Li-Ion cells at 1.5 amps per slot. Even if it pulses to 2.5 amps per channel with those cells it still wouldn't reach the maximum (Opus - are you listening? Eh, probably not.). As it is, I have been running it for over 24 hours and the adapter has remained only slightly warm - which is a very good thing.
Despite the issue I had with the NiMH cells on slot 1 (this causes a 1-star penalty in the rating), I must say there is a lot to like about this little charger. Finally, a Miboxer charger that can do test mode in more than one slot. The current amperage is much improved over the company's first offering in the C4, especially with NiCd/NiMH cells (the C4 tops out at a paltry 600mA current for these type cells), and I think the resistance measurements are a little more accurate. Having the choice of running auto or fixed current makes this unit very flexible with a large spectrum of cell types and capacities and definitely usable with cells that have a capacity of 5000 mAh or higher. This charger also carries the same tradition of being adequately powered as its C4 predecessor, and it runs cool - even when the fan is not engaged. I'd say Miboxer has another winner on its hands.
If there is anything left to be desired, I will ask: When will Miboxer make that 4-slot charger that can discharge on all slots? C4 12+ perhaps?
Up to 1.5A charging/discharging on Li-Ion and LifePO4 cells.
Up to 1A charging and 1.5A discharging on NiCd/NiMH cells.
Ability to define fixed charging and discharging rates.
Supports all round cell sizes including D cells.
Both slots carry all testing features of the charger including resistance measuring and MAH totals.
Useful for higher capacity NiCd/NiMH cells.
Adequate power supply that runs very cool.
Very effective fan cooling.
Slot 1 on charger has difficulty detecting correct resistance level of NiMH cells making auto charging impossible.
Ability to discharge NiMH cells at 1.5A may not be a safe practice.
Fan runs really loud.
Larger cells tend to shift in the slots and may pop out if not seated securely.
2 slots may not be enough for some users.