Oh oops, I meant the battery charger was reading low, your older post about parasitic draw sounds good to me. I bought the base model XL with no bells or wistles so I was thinking in terms of my truck. But I'm not so sure the extra bells and whistles would draw 80% if your battery in a short amount of time. I've run my truck's stereo plus a pair of 12 inch subwoofers for over 4 hours at full power and only got knocked down to about 9-10 volts. How many CCA (Cold Cranking Amps) is your battery? If I go with my 540 CCA down to 80%, that would be a loss of 108 amps and drop your battery down to something like 10 or 11 volts. Did I mess up on my math somewhere or use wrong numbers? If you left your lights on for a good while I'd expect to see something like that but it sounds like you hook the battery tender fairly soon after parking. I am pretty sure a single 55 watt bulb is usually around 4-5 amps. We must be arguing somewhere but I'm not sure over what. :nerd:
Question: What is the final voltage after the charger considers the battery to be at 100%?
Mon, October 12th, 2009, 09:01 PM
Threaded Mode