SV650.org - SV650 & Gladius 650 Forum - View Single Post - how long should a battery hold its charge?

embee · 10-01-11, 02:09 PM

Aftermarket alarms can be notoriously hungry, and bike batteries don't have all that big a capacity so can get drained relatively quickly.

As a very rough guide expect a reasonably serviceable battery to lose between half and one percent per day simply by standing still, the actual service capacity might be only around 75% of the quoted value in real life, and an alarm might take a few milli-amps. You probably need it to be at least half charged in order to start it successfully.

Add these together and you probably can afford to lose around 3-4Ah at most, which at a rough estimate will be something like 4 weeks. (28 days, say 15%=1.5Ah loss due to natural discharge and 700hrs at 2mA = 1.5Ah)

If it doesn't start off fully charged and the drain is greater you might only get a couple of weeks.

10-01-11, 02:09 PM	#4
embee Member Mega Poster Join Date: Jul 2003 Location: Warwickshire Posts: 2,804	Re: how long should a battery hold its charge? Aftermarket alarms can be notoriously hungry, and bike batteries don't have all that big a capacity so can get drained relatively quickly. As a very rough guide expect a reasonably serviceable battery to lose between half and one percent per day simply by standing still, the actual service capacity might be only around 75% of the quoted value in real life, and an alarm might take a few milli-amps. You probably need it to be at least half charged in order to start it successfully. Add these together and you probably can afford to lose around 3-4Ah at most, which at a rough estimate will be something like 4 weeks. (28 days, say 15%=1.5Ah loss due to natural discharge and 700hrs at 2mA = 1.5Ah) If it doesn't start off fully charged and the drain is greater you might only get a couple of weeks. __________________ "Artificial Intelligence is no match for natural stupidity"