Which hähnel remote? I have the Giga T Pro II, and it 'died' on Tuesday (I last used less than a month ago). The transmitter appeared to be functioning (display working), I had put a fresh LR2 battery in the receiver at the last use. It fired the shutter as a wired remote (plugging the cable directly into the transmitter), just not wirelessly. Turned out replacing the CR2032 battery in the transmitter was needed – apparently it can have sufficient power to do everything except send a wireless signal. For location shooting, that means bringing an eyeglass screwdriver along with a spare battery (or just changing it out beforehand).