Originally Posted by
datlas
Wait a second, let me see if I get this...
If I fully charge up my MS batteries, then don't ride for a week, I shouldn't expect a full or nearly-full charge to remain??!!??
I don't connect the battery to the light so the trickle-loss from the LED is not there.
Doug
Batteries can self discharge. Some battery chemistries are worse than others and the amount of discharge can depend on several other factors as well. Li-ion batteries are also susceptible to aging and loss of capacity. Deep cycling and high current draw (like lights do) can cause the batteries to loose capacity too. Bad chargers cause problems too.
Most people mistreat their batteries...even experienced users with years and years of experience and a good knowledge of the battery chemistry
...because they are unaware of the problems. You may have done something wrong...deep discharged them, gotten them hot, shorted them, dropped the pack, etc...long ago and it's just now manifesting. Or it may just be the battery. If you want some light reading
go
here. The Batteries in a Portable World is one of the best places for battery information around.