Reviving Over Discharged Cells - Not Always a Good Idea

StandardBattery

Flashlight Enthusiast
Joined
Sep 2, 2007
Messages
2,959
Location
MA
Incident Report: Forolinternas #37

Sounds like he did not do the revive very slowly, starting at 1.5A with a parallel battery and then moving to 2A on an NCR18650B. Surprised the temp sensor didn't stop it early enough though. Could have been a lot worse though. It may have stop charging and then the battery internally just kept heating because the reaction had started.

Some Photos:
http://subefotos.com/ver/?c5bb152f3a26b09de7b79a96494d36ebo.jpg
http://subefotos.com/ver/?855a4214c71bdb80b2b441ab79d6737eo.jpg
http://subefotos.com/ver/?d7c00aedbebe4e9325a738d693a8de85o.jpg
 

vicv

Flashlight Enthusiast
Joined
Mar 22, 2013
Messages
2,790
Location
Southern Ontario
Ya that's all kinds of bad. First off that particular cell doesn't do well with deep discharge. I had one at 2.5V. Lost 2/3rds capacity. I've found with a good battery to start with a NIMH charge at around 200ma till voltage hits 3.2 volts then a 300mah charge to full on lithium mode
 
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