I have a Braun oral-b pro 2000 toothbrush and with the original battery it now only lasts about 1 minute. I replaced the original 3757 Ni-MH battery with an AA size Ni-MH (higher capacity) battery and the red “battery low” indicator blinking. I had put it on the charger and it charged the battery from 1.45 V to 1.52 V and the green charging light still blinking but it won’t charge any higher. When I want to turn it on it’s not working only the red light still blinking.
Finally, I put back the original battery to see if it went faulty during repair and it's working as intended. I also tried with a bench power supply and it won't work with any voltage only with the original battery. So how is this circuit checking the battery? What’s the trick?
Finally, I put back the original battery to see if it went faulty during repair and it's working as intended. I also tried with a bench power supply and it won't work with any voltage only with the original battery. So how is this circuit checking the battery? What’s the trick?