My 2 year old Petzl NAO seems to have developed a problem. The low battery warning flash, which is supposed to be at about 25%, which is then very (too!!) quickly followed by a second flash and then a fade to the emergency level keeps coming on after about ten minutes use, despite the battery indicating all three green bars charged. Plugging it into the PC shows 70% charge remaining, even after a 50 minute run of faffing around switching it on and off to reset the low battery indicator!

Anyone else had this problem, and ideally found a solution? I'm loathe to buy a new battery as they are £50+ and its only been recharged a maximum of 20-30 times.

thanks!