Li-Po charge retention  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Li-Po charge retention
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Li-Po charge retention - 1/19/2004 1:49:28 AM   
Airbike


 

Posts: 600
Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline 		A quick question for the experts out there.
How well do the Li-Po batteries keep their charge?
Specific example: I'll be using a 3 cell 11.1v, 1200 mah Li-Po pack to replace my 8 cell, 9.6v 800mah Nimh in a small electric with Razor 350 motor( GWS 6.6:1 gearbox) and Phoenix 25 ESC. On the Nimh, I typically peak them just before I fly to get the best performance from them.
But what about the Li-Po's? Since they don't 'peak', will I damage the battery if I try to charge a full or nearly full pack? I'm using the Kokam LiPo 402 charger and the instructions do not mention any thing regarding this issue. How much charge will I be losing if the battery sits a few days after charging and then I go to fly?
Thanks for any help you can give. I did a search but could not find any threads regarding this.
       Post #: 1

RE: Li-Po charge retention - 1/19/2004 2:34:59 AM   
shenion



Posts: 263
Joined: 3/19/2002
From: Stone Mountain, GA, USA
Status: offline 		LiPos have a very slow self discharge, on the order of a few %/month.

Li-Ion/Poly do not peak charge. They use a CV current limit charger. Basically if the batt is charged, it does not draw any more current from the charger. ANy decent LiPoly charger will not overcharge them. The charger does not really "sense" a peak. That batts stop drawing current exponentially towards 0 when they get close to full charge. If you disconnect a batt from the charger and later charge again, the batt will not charge any more.

I have left Lipos on my charger for months, with no problems. The Kokam charger should do the same, only charge as needed.

_____________________________

Scott Henion
My Planes page:[color=red] [link]http://shdesigns.org/planes.html[/link][/color]

(in reply to Airbike)
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