"Jeff Liebermann" wrote in message
...
On Wed, 7 Feb 2018 11:23:23 -0800, sms
wrote:
This is the battery in the original pack:
http://www.gebc-energy.com/Uploadfile/pdf/ICR18650/ICR18650H3.pdf

4.3V max seems rather high and unsafe.

I disassembled the pack. The batteries are completely discharged, 0V. To
me this indicates a failure of the protection circuit which normally
would not allow discharge below 2.8V.

Automatic polarity protection - it needs a little voltage to tell which way
round it is.

Passing current with a car headlamp bulb in series with a 12V battery
usually gets enough voltage lift for detection.