i have a big question:
what battery would you trust more between a 4year old 18650 that have 70% of its capacity and a 11year old 18650 battery that have 90% of its capacity?
those 2 batteries come from used labtop
those 2 batteries are panasonic CGR18650 E
and the battery is to be used in low ah draw aplication 0.5C or less
11 year 90%
will be the better cell But …i’m only guessing .i’d charge them both up and then let them sit for 3 weeks and then test voltage of them… the one with the highest is the winner .
Cells at Gearbest are too cheap to jerk around …no matter how badly someone may hate gearbest … the safer battery will be the one in the mail .
Just a small addition. I’ve had some laptop puls keep voltage “stable”, say at 4.10V after charging, but they weren’t able to give out any current. I.e. when used in a flashlight, the light was low on any mode. Much lower than it was supposed to be.