Lithium Polymer Batteries

[wenzchen]

I am currently trying to model the performance of lithium polymer batteries. I am no expert on batteries.

Based on the manufacturer's specs for the battery, the battery has a capacity of 850 mAh, nominal voltage of 3.7 V and a charge voltage of 4.2 V. If I were to charge the battery with a charge voltage of 4.1 V, would the battery have a lower capacity than 850 mAh?

Any help would be greatly appreciated.

 

[GregLocock]

No, but it'll take at least 20% longer to charge, I suspect. There may be some chemistry dependent effects as well, for that you need the detailed specs from the manufacturer.

Basically with LiPo you are well advised to do as they recommend, or build in good fire protection.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[wenzchen]

Thanks!

 

[geekEE]

That battery is designed to be charged to 4.2V for the rated capacity, so you will have a lower capacity at 4.1V, but it will only be slightly less, depending on your discharge rate. Take a look at the graph on this page.

http://learn.adafruit.com/li-ion-and-lipoly-batteries/voltages

Glenn