charging a123 pack with nimh charger?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> charging a123 pack with nimh charger?
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charging a123 pack with nimh charger? - 2/7/2008 12:11:19 AM   
Deftones123


 

Posts: 716
Joined: 10/25/2007
From: orlando, FL, USA
Status: offline 		I just bought the vpx battery pack and made a 2 cell pack to run in my team losi mini-t, i then charged it on a 600mah nimh 2 hour charger and then used it, it charged and ran fine not hott or warm at all it was crazy fast and I was amazed by how good it ran. I was wondering if it is possible to actually charge them on that kinda of charger? I have charged them about 5 times already and each time run amazing
       Post #: 1

RE: charging a123 pack with nimh charger? - 2/7/2008 10:48:42 AM   
coro_sk


 

Posts: 18
Joined: 7/24/2007
From: , SLOVAKIA
Status: offline 		I am afraid of that answer is no, for sure. Even if they did survived 5 times till now.
NiCD and Nimh chargers mostly do not care about voltage at all, thus they may highly overcharge LiXX pack of any brand.
A123 (LiFe) chemistry is reliable and can withstand severe abuse, but using NiMH charger seems to me too much.
Overcharged cell(s) will die.

It may be possible to charge them as 3-cell 6V lead-acid using old charger, as the lead-acid charge uses the same CC-CV charge scheme based on maximum voltage. Final voltage for 6V lead-acid is somewhere near 2.45V/cell, which is close to 2x 3.6V (3*2.45=7.35, gives 3,75V/cell which is acceptable for A123).

It may be also possible to use A123 capable LBA10-A Hyperion balancer, which will break the charge at 3.9V per cell, with any source of constant charge current (including as simple as 12V car bulbs, hooked to car battery).

(in reply to Deftones123)
       Post #: 2

RE: charging a123 pack with nimh charger? - 2/9/2008 9:22:19 PM   
Deftones123


 

Posts: 716
Joined: 10/25/2007
From: orlando, FL, USA
Status: offline 		whats a cheap charger I could buy to charge them?

(in reply to coro_sk)
       Post #: 3

RE: charging a123 pack with nimh charger? - 2/9/2008 9:34:48 PM   
everydayflyer



Posts: 858
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		You can also use one of these with the charger you have.

http://www.infinity-hobby.com/main/product_info.php?cPath=30_77&products_id=1877

$35 . $20 plus $14 shipping.

Charles

(in reply to Deftones123)
       Post #: 4

RE: charging a123 pack with nimh charger? - 2/9/2008 10:04:11 PM   
Deftones123


 

Posts: 716
Joined: 10/25/2007
From: orlando, FL, USA
Status: offline 		how does that work, just solder it to my wires of my nimh charger? and how long would I have to charge them if I did that?

(in reply to everydayflyer)
       Post #: 5

RE: charging a123 pack with nimh charger? - 2/10/2008 1:54:17 AM   
Deftones123


 

Posts: 716
Joined: 10/25/2007
From: orlando, FL, USA
Status: offline 		o and im using a wall charger by the way?

(in reply to Deftones123)
       Post #: 6

RE: charging a123 pack with nimh charger? - 2/10/2008 3:34:26 AM   
everydayflyer



Posts: 858
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline
quote:

i then charged it on a 600mah nimh 2 hour charger and then used it,


Most solder matching input and output connector on.

How long. Well at 600 mA about 2 hours for a 1100 mAh and about 4 hours for a 2300.

Charles

(in reply to Deftones123)
       Post #: 7

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