Hi,
I use a working similar battery in parallel with the protected bat to be charged. This will jump start the bat and the Opus will start to work. Once it is starts to charge I remove the jumper bat.
thanks,
Tigman
Hi
I like to charge and analyze my batteries.
My recommend charger is the Opus-BT-C3100. It is helpful for matching batteries and knowing when the capacity is low.
Luck in your search!