tx lipo pack over discharged ?

[Justin B]

Yesterday I charged the battery 1000mah on .5A nimh setting and when I tried to charge on lipo setting it would not charge (voltage too low)so I left it outside last night in a lipo sack and all day while at work. It was hot and sunny in the 90's. When I got home I decided to try one last time to see if it would charge on lipo setting.For some reason it started to charge all the way up to 14.8v with no puffing and the battery never got above room temperature, however after it was finished charging I watched the voltage dropping on the charger screen (ice) I don't remember ever seeing that before but it went down to 13.8v before I unplugged it. It's resting peacefully outside again tonight and after work tomorrow I'm thinking I might try to discharge it and maybe charge again and see what happens...

[BrianG]

Originally Posted by Justin B

...however after it was finished charging I watched the voltage dropping on the charger screen (ice) I don't remember ever seeing that before but it went down to 13.8v before I unplugged it...

A lipo should NOT do that. Once the CV stage begins, the voltage should stay "locked" at 4.2v/cell and the current should decrease until whatever the charger deems the end current to be. If the voltage is dropping during the CV stage, either something is wrong with the charger or pack.