"Theo Markettos" wrote in message
...
I'm trying to source a replacement lithium ion battery for a laptop (an
Advent 6412 as it happens). The original is rated at 14.8V, 3600mAh.
Various vendors seem to have correctly-shaped batteries at this voltage
but
at 3900mAh, 4000mAh or 4400mAh.

The higher capacity battery will be fine if they are indeed correct for your
laptop model, and the charging circuit will probably make full use of the
extra capacity. These charging systems are intelligent and will charge the
battery until it is full.

Dave