In my community, we have interruptions of electricity more than average. My alarm clock has one of those 9v battery backups, but one 4 hour blackout can significantly drain the battery, requiring me to check and frequently change it. One solution would be to connect my alarm clock to an uninterruptable power supply. But I would need atleast a 500VA, they can be expensive and many of them beep when running on battery power. I was wondering if I could just wire in a 9v rechargable NIMH battery (8.4v) and connect the output of a cheap 9v-style battery charger to this battery (such as
- posted
19 years ago