.......Don't know about other manufacturers but Nikon have this battery indicator system shows both charge and how much life left in the battery in terms of how much more charge cycles it will support.
Seriously, it was just easier to buy a battery off the net for $20 odd bucks and have a spare anyhow.
This aftermarket battery works perfectly. This was now about 5-6 years ago. Nikon battery has issues, aftermarket battery is flawless!
Note too, this is all Nikon's doing in that they have some electropokery/programming garbage to stop folks from using aftermarket batteries. The battery needs a chip for it to work.
So it turns out that Nikon themselves can't sort out this 'chip' in their own battery as well as the aftermarket manufacturers do!