The batteries are loose in the case, so a sudden tap on the bacl shifts it on the contacts and it's like a momentary battery pull. Take a business card, cut in half and fold the remaining half in half - then doublestick tape it to the upper half of the battry. The battery cover will be very tight when snapped in (and somewhat difficult to remove after that - that's the idea). I use quickpull app or the 3-finger salute (alt, l-aA and delete) to pull the battery.