Unfortunately, these DO NOT SOLVE the problem. Taking others about batteries or chargers basically thinking others are not knowledgeable, and I will reserve comment on these replies.
The LUMIX 1000M2 is by far the worst camera when it comes to battery performance. The camera seems to work well and will hold a charge but at other times it can be turned off with ½ battery and in the morning be dead?
This is not typical for any battery or camera or from not charging properly or other lame responses.
I myself have noted this on several occasions with multible different batteries.
No idea as to why?
Suggest, until a REAL SOLUTION is found, do what I did..
But a half dozen batteries and portable (Car or AC) charger.
As stated by previous, ISB is a poor option for charging.