I want a device I can put on/near my battery
that will cut off the power from the battery
when voltage drops too low, thus preventing a complete discharge.
I'd expect to see these available everywhere 12V batteries are sold, yet I can't find them anywhere at all.
I bought last fall
seems 100% dead and I'm not sure why. Perhaps the guy who wired my new brakes
in left a short somewhere. Or I left a light
on, but the only lights
that might have been on are LED and I'd expect them to take over a week to drop that battery from over 12V to below the 8v at the low end of my meter's scale. It was around 12V one night, completely dead in the morning. 30 minutes charging from my car @14v and still reading under 8V. So I assume it's dead.
I assume some battery maker has a patent and won't let make anyone make any devices to do this because it would mean millions of less dead batteries, thus millions less battery sales every year???
Heck, every battery should have one of these built in from the factory!!! It couldn't cost more than a few bucks for such a protection circuit if made by the thousands/millions.