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Product Description
The La Crosse Technology BC700 Alpha Power Battery Charger has four modes and charges all NiCd and NiMH AA and AAA rechargeable batteries. The four modes include charge, discharge (discharges the batteries and then recharges them), recharge (discharges and recharges up to 20 times to bring old batteries back to life) and test (displays the battery capacity). BC-700 Battery Charger " Features: • All modes automatically default to 200 mA charge on the BC-700 Battery charger • Charge both AA and AAA rechargeable batteries simultaneously and will charge all Low-Discharge batteries. Sanyo Eneloop, Uniross Hybrio, Nexcell EnergyOn, Accupower Acculoop and other future low discharge batteries. • Hhas Four independent channels - Charges 1, 2, 3 , or 4 rechargeable batteries at a time. • Overheat detection to protect over-charging and LCD shows capacity for each battery when charging is complete • Charge Mode - allows a range of user selectable milliamp settings from 200 to 700 for faster charging times. Within 4 seconds after rechargeable batteries are inserted charging automatically begins at 200mA, or you may select 500, or 700mA charge rates for faster charging times. • Discharge Mode - reduces memory effect by discharging rechargeable battery completely before recharging to full capacity. User selectable. • Refresh Mode - discharges and recharges up to 20 cycles or until rechargeable battery is refreshed to full capacity. User Selectable. • Test Mode- First charges the rechargeable battery to full capacity, then discharges completely to measure rechargeable battery capacity for display in mAh or Ah, and then recharges each rechargeable battery to full battery capacity. • UL approved, BC 700 charger also has safeguards that sense rechargeable battery polarity, rechargeable battery temperature and defective rechargeable batteries. • World Voltage capable - Operates on 100~240V AC Input.
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Customer Reviews
Most Helpful Customer Reviews
1,337 of 1,365 people found the following review helpful
[Update on April 4, 2012]
My original review was written back in August 2007. Now, nearly 5 years later, most of its content is no longer current. So I will use this spot for publishing my "Frequently Asked Questions" relating to BC-700/900/1000 family of chargers. This list is work in progress and will grow with time. Let me know if you have new questions to be added. Here goes...
[Q1] There are four operation modes on the BC-700 (Charge, Discharge, Test and Refresh). Which mode should I use and when?
[A] Most of the time you just need CHARGE mode. That means put in the batteries and select the charging current desired (500/700mA, etc)
- If you want to know how much capacity your batteries can actually hold, use the CHARGE/TEST function. Be careful not to run this operation if the batteries are freshly charged (doing so may lead to over-charging).
- If you want to find out the remaining charge in a battery, run DISCHARGE/REFRESH and record the 'mAh' number at the end of the first discharge.
- If you suspect your batteries suffer from reduced capacity, run the DISCHARGE/REFRESH operation. Or you can use this mode to refresh your batteries once every 6 months or so. Don't over do it!
[Q2] Why won't the MODE button response when I press it?
[A] Press and hold the MODE button for 3 seconds, then toggle it to change mode.
[Q3] What is the difference between TEST and REFRESH?
[A] TEST starts with a full recharge, then it discharges the cell once to determine its capacity. Next it recharges the cell to full again.
REFRESH starts with a discharge to determine the cell's remaining charge capacity, then it charges the cells back up and drain it down again to determine its new capacity. It wil repeat this Charge/Discharge cycle multiple times until the capacity stops improving. Finally it charges the cell in the end.
[Q4] My BC-700 has been discharging and refreshing for 3 days!! When does it stop?
[A] The REFRESH operation takes at least three Discharge/Recharge cycles to complete. If you use the default 100mA discharging (200mA charging) current for a 2000mAh AA cell, each Discharge/Recharge cycle takes about 30 hours! Terminate the Refresh operation and restart it using 350mA discharging (700mA charging) instead.
[Q5] What is the best charging current for recharging AA or AAA batteries?
[A] For AAA cells the default 200mA is just right. If you're in a hurry, increase the current to 500mA.
For AA cells you should increase the charging current to either 500mA or 700mA. This reduces the charge time and, more importantly, ensure that the charger will not miss charge termination signal and ends up over-charging your cells.
[Q6] How does the BC-700 know when to stop charging?
[A] The primary termination mechanism is "negative delta-voltage detection" (-dV/dt). If this signal is missed, backup mechanism include: high voltage termination, over-temperature shutdown, and safety timer (stops when total charge > 3700mAh)
[Q7] I ran a Charge/Test operation but in the end it shows a capacity reading of "000 mAh". Are my batteries dead?
[A] Most likely the charger missed the -dV/dt termination signal, and subsequently tripped either over-voltage or over-temperature shutdown.
[Q8] I used the BC-700 to recharge my Duracell 2650mAh batteries, and the capacity readings are over 3000mAh. Are those batteries great or my charger is bad?
[A] When you use CHARGE, the 'mAh' reading is for amount of charge going INTO the battery, not what is actually STORED by the batteries. Because the energy conversion is not 100%, you always need to put in more charge, especially if your batteries are old or leaky. To find out the charge stored, use either Charge/Test, or Discharge/Refresh
[Q9] I put in a set of exhausted batteries and one of them shows 'null'. Is the battery dead?
[A] If a battery has been over-discharged, its terminal voltage may fall below 0.5V and the BC-700 cannot detect it. You can kick-start it by using my "Paper Clip trick" (see customer image section for details), or by charging the dead cell in a dumb charger for a few minutes. Then the BC-700 will recognize it.
[Q10] Why can't I tell how much charge is left in my battery instantly?
[A] No battery testers in this world can do that. The only reliable way is to run Discharge/Refresh. However, you can estimate the `fullness' of your battery by looking at its voltage. When you first insert in a battery, its voltage is displayed for 8 seconds. If the voltage is higher than 1.30V, the battery is mostly full and you don't need to recharge it. If it is below 1.20V, it is nearly exhausted.
[Q11] How do I power the BC-700/1000 from my car battery?
[A] You need a CLA (cigarette lighter adapter) with 3V output at a 2.1/5.0mm barrel jack; current rating of 3A for the BC-700, 4A for the BC-1000. Foer example: AccuPower AP12243 Car Adapter. An easier solution is to get the La Crosse BC500 which runs off 12V directly.
[Q12] What is the REAL advantage of having an advanced charger like the BC-700?
[A] It allows you to determine the true capacity of all your batteries, and to revive those under-performing cells. Then you can group cells with similar capacities together for best result. Plus it looks cool and is a chick-magnet... just kidding!
[Q13] Is it normal for noise to come out from my BC1000 when it is charging batteries?
[A] Yes. The BC-700/1000 uses pulsed charging current at 25% 1 Hz. So when you set the current to 700mA, internally it is putting out 2800mA for 1/4 second. That's why it emits a faint ticking sound once every second.
[Q14] Why am I not able to see a charge termination even at 500 mA charge rate on my brand new AA Eneloops? (Voltage on the battery was 1.43 V when I manually pulled out. When I insert the same battery again it promptly says full!)
[A] It is normal for eneloop cells to reach at least 1.48V just before the delta-voltage drop is detected. If you remove a cell while it is only 1.43V and re-insert it right back, the charger detects a higher than expected voltage for NiMH cell, so it treats the cell as full and will not recharge it. Otherwise it could miss the delta-V detection from this stage.
[Q15] What is "charge rate" and how does it relate to charge time?
- Charge rate C = charging current (mA) / Capacity (mAh)
- Charge time (hr) = Capacity (mAh) / Current (mA) = 1/C
Therefore 0.2C means a charge time of 5 hours, for example
[Q16] What is the best charge rate?
[A] The general recommendation from battery manufacturers is to keep the charge rate between 0.5C and 1C. Higher charge rate shortens battery lifespan. Lower charge rate may cause charger to miss termination signal. In practice, a rate between 0.25C and 0.5C is preferred if pulse-charging technique is used.
[Q17] If I recharge an 800mAh AAA battery at 200mA, is there a danger of missing charge termination signal at 0.25C?
[A] No. The BC-700/900/1000 uses pulsed current at 25% duty cycle. So when you select '200mA', the actual charging current is 800mA for 0.25 second, followed by 0mA for 0.75 second. Therefore although the DC heating effect is at 0.25C, the charge termination signal is determined at 1C. On the other hand, charging a 2000mAh AA cell at 200mA is borderline too low and should be avoided.
[Q18] I have some old batteries that developed high internal resistance. Will it help by cycling those batteries in REFRESH mode?
[A] The problem with higher internal impedance cannot be reversed. Your best hope is to charge them at the slowest rate, then use them for less demanding appliances such as wireless keyboards. But if they also suffer from rapid self-discharge problem, then you should just recycle them.
[Q19} How do I find out the firmware version of my charger?
[A] When you first connect the charger to AC adapter, the rightmost column shows the firmware number. For example, '35' means firmware v35.
[Q20] How does the AccuPower IQ-328 Battery Charger compare to the BC-700/1000?
[A] Except for some very minor differences, the IQ-328 is identical to the BC1000, down to the same bugs. See details here: http://www.amazon.com/review/R1W62S0X09QMMQ/
===============
Original Review titled "Handicapped version of BC900" follows:
===============
Just in case you were looking for the La Crosse Technology BC-900 AlphaPower Battery Charger: please be advised that ths is NOT the same charger.
Except for the color, the BC700 looks exactly the same as the better-known BC900. However, it is actually a "handicapped" version of the old charger. Its charging current can only go up to 700mA in three steps (200/500/700). The BC900, on the other hand, can go up to 1000mA for 4 cells, or 1800mA for 2 cells. Also the BC900 package includes eight NiMH rechargeable cells (4 AA and 4 AAA), eight C/D cell adaptors, and a carrying case. The BC700 does not come with any bonus items.
This is not to say that the BC700 is a bad product. Quite the contrary, it is better than any other NiMH AA chargers in the market except for BC900 and Maha MH-C9000. If you can find it at a substantial saving (like maybe 30% off from the price of BC900), it is still a good buy. Read more ›
My original review was written back in August 2007. Now, nearly 5 years later, most of its content is no longer current. So I will use this spot for publishing my "Frequently Asked Questions" relating to BC-700/900/1000 family of chargers. This list is work in progress and will grow with time. Let me know if you have new questions to be added. Here goes...
[Q1] There are four operation modes on the BC-700 (Charge, Discharge, Test and Refresh). Which mode should I use and when?
[A] Most of the time you just need CHARGE mode. That means put in the batteries and select the charging current desired (500/700mA, etc)
- If you want to know how much capacity your batteries can actually hold, use the CHARGE/TEST function. Be careful not to run this operation if the batteries are freshly charged (doing so may lead to over-charging).
- If you want to find out the remaining charge in a battery, run DISCHARGE/REFRESH and record the 'mAh' number at the end of the first discharge.
- If you suspect your batteries suffer from reduced capacity, run the DISCHARGE/REFRESH operation. Or you can use this mode to refresh your batteries once every 6 months or so. Don't over do it!
[Q2] Why won't the MODE button response when I press it?
[A] Press and hold the MODE button for 3 seconds, then toggle it to change mode.
[Q3] What is the difference between TEST and REFRESH?
[A] TEST starts with a full recharge, then it discharges the cell once to determine its capacity. Next it recharges the cell to full again.
REFRESH starts with a discharge to determine the cell's remaining charge capacity, then it charges the cells back up and drain it down again to determine its new capacity. It wil repeat this Charge/Discharge cycle multiple times until the capacity stops improving. Finally it charges the cell in the end.
[Q4] My BC-700 has been discharging and refreshing for 3 days!! When does it stop?
[A] The REFRESH operation takes at least three Discharge/Recharge cycles to complete. If you use the default 100mA discharging (200mA charging) current for a 2000mAh AA cell, each Discharge/Recharge cycle takes about 30 hours! Terminate the Refresh operation and restart it using 350mA discharging (700mA charging) instead.
[Q5] What is the best charging current for recharging AA or AAA batteries?
[A] For AAA cells the default 200mA is just right. If you're in a hurry, increase the current to 500mA.
For AA cells you should increase the charging current to either 500mA or 700mA. This reduces the charge time and, more importantly, ensure that the charger will not miss charge termination signal and ends up over-charging your cells.
[Q6] How does the BC-700 know when to stop charging?
[A] The primary termination mechanism is "negative delta-voltage detection" (-dV/dt). If this signal is missed, backup mechanism include: high voltage termination, over-temperature shutdown, and safety timer (stops when total charge > 3700mAh)
[Q7] I ran a Charge/Test operation but in the end it shows a capacity reading of "000 mAh". Are my batteries dead?
[A] Most likely the charger missed the -dV/dt termination signal, and subsequently tripped either over-voltage or over-temperature shutdown.
[Q8] I used the BC-700 to recharge my Duracell 2650mAh batteries, and the capacity readings are over 3000mAh. Are those batteries great or my charger is bad?
[A] When you use CHARGE, the 'mAh' reading is for amount of charge going INTO the battery, not what is actually STORED by the batteries. Because the energy conversion is not 100%, you always need to put in more charge, especially if your batteries are old or leaky. To find out the charge stored, use either Charge/Test, or Discharge/Refresh
[Q9] I put in a set of exhausted batteries and one of them shows 'null'. Is the battery dead?
[A] If a battery has been over-discharged, its terminal voltage may fall below 0.5V and the BC-700 cannot detect it. You can kick-start it by using my "Paper Clip trick" (see customer image section for details), or by charging the dead cell in a dumb charger for a few minutes. Then the BC-700 will recognize it.
[Q10] Why can't I tell how much charge is left in my battery instantly?
[A] No battery testers in this world can do that. The only reliable way is to run Discharge/Refresh. However, you can estimate the `fullness' of your battery by looking at its voltage. When you first insert in a battery, its voltage is displayed for 8 seconds. If the voltage is higher than 1.30V, the battery is mostly full and you don't need to recharge it. If it is below 1.20V, it is nearly exhausted.
[Q11] How do I power the BC-700/1000 from my car battery?
[A] You need a CLA (cigarette lighter adapter) with 3V output at a 2.1/5.0mm barrel jack; current rating of 3A for the BC-700, 4A for the BC-1000. Foer example: AccuPower AP12243 Car Adapter. An easier solution is to get the La Crosse BC500 which runs off 12V directly.
[Q12] What is the REAL advantage of having an advanced charger like the BC-700?
[A] It allows you to determine the true capacity of all your batteries, and to revive those under-performing cells. Then you can group cells with similar capacities together for best result. Plus it looks cool and is a chick-magnet... just kidding!
[Q13] Is it normal for noise to come out from my BC1000 when it is charging batteries?
[A] Yes. The BC-700/1000 uses pulsed charging current at 25% 1 Hz. So when you set the current to 700mA, internally it is putting out 2800mA for 1/4 second. That's why it emits a faint ticking sound once every second.
[Q14] Why am I not able to see a charge termination even at 500 mA charge rate on my brand new AA Eneloops? (Voltage on the battery was 1.43 V when I manually pulled out. When I insert the same battery again it promptly says full!)
[A] It is normal for eneloop cells to reach at least 1.48V just before the delta-voltage drop is detected. If you remove a cell while it is only 1.43V and re-insert it right back, the charger detects a higher than expected voltage for NiMH cell, so it treats the cell as full and will not recharge it. Otherwise it could miss the delta-V detection from this stage.
[Q15] What is "charge rate" and how does it relate to charge time?
- Charge rate C = charging current (mA) / Capacity (mAh)
- Charge time (hr) = Capacity (mAh) / Current (mA) = 1/C
Therefore 0.2C means a charge time of 5 hours, for example
[Q16] What is the best charge rate?
[A] The general recommendation from battery manufacturers is to keep the charge rate between 0.5C and 1C. Higher charge rate shortens battery lifespan. Lower charge rate may cause charger to miss termination signal. In practice, a rate between 0.25C and 0.5C is preferred if pulse-charging technique is used.
[Q17] If I recharge an 800mAh AAA battery at 200mA, is there a danger of missing charge termination signal at 0.25C?
[A] No. The BC-700/900/1000 uses pulsed current at 25% duty cycle. So when you select '200mA', the actual charging current is 800mA for 0.25 second, followed by 0mA for 0.75 second. Therefore although the DC heating effect is at 0.25C, the charge termination signal is determined at 1C. On the other hand, charging a 2000mAh AA cell at 200mA is borderline too low and should be avoided.
[Q18] I have some old batteries that developed high internal resistance. Will it help by cycling those batteries in REFRESH mode?
[A] The problem with higher internal impedance cannot be reversed. Your best hope is to charge them at the slowest rate, then use them for less demanding appliances such as wireless keyboards. But if they also suffer from rapid self-discharge problem, then you should just recycle them.
[Q19} How do I find out the firmware version of my charger?
[A] When you first connect the charger to AC adapter, the rightmost column shows the firmware number. For example, '35' means firmware v35.
[Q20] How does the AccuPower IQ-328 Battery Charger compare to the BC-700/1000?
[A] Except for some very minor differences, the IQ-328 is identical to the BC1000, down to the same bugs. See details here: http://www.amazon.com/review/R1W62S0X09QMMQ/
===============
Original Review titled "Handicapped version of BC900" follows:
===============
Just in case you were looking for the La Crosse Technology BC-900 AlphaPower Battery Charger: please be advised that ths is NOT the same charger.
Except for the color, the BC700 looks exactly the same as the better-known BC900. However, it is actually a "handicapped" version of the old charger. Its charging current can only go up to 700mA in three steps (200/500/700). The BC900, on the other hand, can go up to 1000mA for 4 cells, or 1800mA for 2 cells. Also the BC900 package includes eight NiMH rechargeable cells (4 AA and 4 AAA), eight C/D cell adaptors, and a carrying case. The BC700 does not come with any bonus items.
This is not to say that the BC700 is a bad product. Quite the contrary, it is better than any other NiMH AA chargers in the market except for BC900 and Maha MH-C9000. If you can find it at a substantial saving (like maybe 30% off from the price of BC900), it is still a good buy. Read more ›
367 of 372 people found the following review helpful
Amazon Verified Purchase
UPDATE: (08-12-2012) It has been 5 years since I wrote this review. This charger is still working great!
I have owned at least 8 chargers in the past, Maha's, Panasonic, etc. It is nice to see that this charger shows you the mAh on the LCD panel as the battery charges up. Most chargers you only see an LED indicator to signal when charging is done.
Compared to the specs of BC-900, the BC700 can only go up to 700mA (the max) which means it is somewhat slower than the BC900. But the faster the battery charges, the hotter it gets. And one of the worst enemy of rechargeable batteries is heat. Less heat means longer life for the batteries.
Pros:
- 3 adjustable charging speeds
- Will show you the actual capacity in mAh. This is good so you know which battery needs to be refreshed. You always want to use batteries with the same capacities in pair or in a group.
- 4 independent charging stations with individual LED readouts. "AA's" and "AAA's" can be charged in different combinations. Don't you hate those gadgets that only use 3 batteries like portable radios? (walkie-talkies). You end up with 1 un-used battery if you bought a 4-pack. How will you charge it if your charger only charges in pairs?
- Reasonable price for an excellent charger
- Small and light. Better portability
- Multi-volt up to 240v. Very useful if you travel a lot to other countries.
Cons:
Now I have to stop myself doing impulse buying on NiMh's because I enjoy using this charger too much.
I have owned at least 8 chargers in the past, Maha's, Panasonic, etc. It is nice to see that this charger shows you the mAh on the LCD panel as the battery charges up. Most chargers you only see an LED indicator to signal when charging is done.
Compared to the specs of BC-900, the BC700 can only go up to 700mA (the max) which means it is somewhat slower than the BC900. But the faster the battery charges, the hotter it gets. And one of the worst enemy of rechargeable batteries is heat. Less heat means longer life for the batteries.
Pros:
- 3 adjustable charging speeds
- Will show you the actual capacity in mAh. This is good so you know which battery needs to be refreshed. You always want to use batteries with the same capacities in pair or in a group.
- 4 independent charging stations with individual LED readouts. "AA's" and "AAA's" can be charged in different combinations. Don't you hate those gadgets that only use 3 batteries like portable radios? (walkie-talkies). You end up with 1 un-used battery if you bought a 4-pack. How will you charge it if your charger only charges in pairs?
- Reasonable price for an excellent charger
- Small and light. Better portability
- Multi-volt up to 240v. Very useful if you travel a lot to other countries.
Cons:
Now I have to stop myself doing impulse buying on NiMh's because I enjoy using this charger too much.
130 of 146 people found the following review helpful
By Highlander
Amazon Verified Purchase
This is a great charger and when I bought it it was about $15 less than the BC-900. Now the BC-900 is less than this charger. The difference between this charger and the BC-900 is the lack of the faster charging speeds and the accessories. Definitley buy the BC-900 and the accessory package for less money. It seems they are constantly playing games with the pricing on these two chargers. The BC-700 charger does a great job of reconditioning batteries and the charging speed is usually between 2-3 hours for the different capacity batteries that I have. (1800mh - 2650mh). Time is not an issue for me as I have about 10 sets of AA's and can just keep swapping them out. From what i've read the slower charging speed is better for the life span of your battery any way.
Most Recent Customer Reviews
5.0 out of 5 stars
A very useful product
If you use rechargeable batteries, this product is a lifesaver, or should I say battery-saver. The ability to refresh and recondition batteries as well as being able to see the... Read more
Published 2 hours ago by Doug James
4.0 out of 5 stars
Does what it says.
so far the charger does what it says it would - albeit very slowly.
I find the process times on all of the functions to be very slow. Read more
I find the process times on all of the functions to be very slow. Read more
Published 16 hours ago by Stephen
4.0 out of 5 stars
worked great for a year....
this thing worked great...used heavily for a year....then heated up and is now toast. I am not sure what caused it, but will probably buy another one to replace the burned out... Read more
Published 1 day ago by Kathy Clees
5.0 out of 5 stars
Great Charge
I like the fact that you can charge each individual battery separately. The Digital display is easy to understand and the different charge mode is convenient.
Published 2 days ago by Jim Lornklang
5.0 out of 5 stars
Good value
Basic charger that meets the needs of most consumer users. Works as advertised - I have used on old rechargeables and it gets the most out of them. Read more
Published 2 days ago by BillP
5.0 out of 5 stars
MUST HAVE
If you use a lot of rechargable AA or AAA batteries in your home and want your batteries to last a long time in top performance status this is a must have piece of equipment. Read more
Published 3 days ago by Gerald L. Hill
4.0 out of 5 stars
Great Visual Aid
Great Visual Aid to give you an accurate idea of your rechargeable batteries, especially if you have a lot. Read more
Published 5 days ago by Omari
5.0 out of 5 stars
Produit vraiment inétressant
J'ai utilisé ce chargeur à plusieurs reprises et il a redonné une seconde vie à mes batteries Eneloop qui commençaient à perdre de la puissance... Read more
Published 5 days ago by Nicole Lemire
5.0 out of 5 stars
Great value.
I read reviews on several of the La Crosse and other smart chargers. Chose this one because it didn't come bundled with batteries (I have already invested in a lot of Eneloop,... Read more
Published 5 days ago by Thomas J Duffy
4.0 out of 5 stars
This Thing's a Winner--Paying the Extra Buck Pays Off
I just put in an order for a second one of these as combination backup and "positions 5 through 8". I love the way you can set this on slower charge rates than the full blast the... Read more
Published 7 days ago by R. L. MILLER
