Alberta Land Rover Enthusiasts Club Forum
General => Technical Discussions => Topic started by: brendan leier on July 10, 2019, 05:03 PM
I left my lights on overnight and just discovered this oversight. I have an optima battery and I have vague recollections on group members having issues recovering dead batteries. Is there anything wrong with slapping the trickle charger on and hoping for the best?
If you have the red top then measure the voltage on it. If it's below 4 volt you will need another DC battery to wake it up. I am away from town but can catch up with you when I get back. These batteries recharge well if you are using them daily.
Got it jumped with a portable device. thanks!
I'm not sure how far that battery was flattened, or if 4 volts is the cutoff point for murdering one, that would be 0.6V/cell, quite low.
It's good that the battery didn't freeze, there is some hope in keeping it. I've flattened new batteries a few times, and they didn't last very long, maybe a year. Give it a few months of regular use and test with a battery load tester after having the battery sit. You'll know as well after starting it in winter.
The procedure for recharging a flattened battery is a low-current standard battery charge. Often a smart charger won't charge a battery that's discharged too far. Maybe like 2A or so, or a small solar panel. Charging a flattened battery with too much current will damage the battery, and is often a factor in their eventual failure.