Also you are able to revive a dead cell, I had a battery drained to 0.1v per cell, 2 puffed one didn't so I attached that one cell to a old battery about 1year old with also 0.2v per cell, charged a bit on Nimh mode and it's working fine again now and I now own a 4s
In the event of a spelling mistake , I Blame Tapatalk