Charger question???

[jbb]

I'm kinda confussed about my charger.... so I'm charging a 7.4 v 2 s battery and the charger stops at 8.4 is this not meaning that its over charging my batteries.... here's a picpic also its an 800 mah pack and the charger only says 500 something mah? Anyhelp will be greatly appreciated thx jbb

Sent from my Nexus S 4G using Tapatalk

[Charlie-III]

The 7.4 volts on your pack is a nominal voltage, fully charged it is higher than that, you are fine as is your charger.
As to the final mah put in, does the charger time out? You are close to 120 minutes (2 hours) which is a normal timeout whether the pack is full or not.
What charge rate do you use, you should be using0.8amps at least.

[Rok Krawl]

your voltage is fine. I charge my 11.1 lipo pack and when fully charged its over 12V. I see it charged to 571mah. If you were to completely drain the pack it may never take a charge again.

Whatever you run this in prolly has a cut off so that the battery wont be completely drained. A voltage cut off. Maybe you could lower this but risk the killing the battery. Or you could just get a higer mah pack.

[jbb]

Thanks for the replies.... it was a brand new battery .... so that's prolly why only 571 mag I'm sure it had a little charge in it

Sent from my Nexus S 4G using Tapatalk

[JonU]

As Charlie said, 3.7v is the nominal voltage. When fully charged a lipo will be at 4.2v per cell which with a 2s pack gives you 8.4v. Also, when charging the only time I've ever seen a pack come close to taking its rated capacity is when balance charging, on normal charging it shouldn't require a full charge since the batteries are never completely discharged. You should have some sort of low voltage cut off that is set to keep your batteries from going under roughly 3.2v per cell.