Frankly seen the cost of this Panasonic battery could have done better. In the era of space probes sent to the depths of the universe, one could have a battery that does not expire after a hundred photos (no flash!). So plan-2 if you go on a trip and even 3 as the GM1 is really too gourmand.En what Panasonic case should fit the battery. Counting 1:30 to recharge.