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FJR Motorcycle Forums
Technical & Mechanical Problems
Battery discharging whilst parked over 3 weeks. Is this normal?
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<blockquote data-quote="bramfrank" data-source="post: 243166" data-attributes="member: 2163"><p>Don't take this the wrong way but . . . (in no particular order)</p><p></p><p>1. We have meters today that can measure microamps and instruments available that are orders of magnitude more sensitive - there really is no drain that can deplete a 12AH battery that is in good condition in 3 weeks that can't be measured. This translates into something like 23 milliamps to complete flat - about half that to 'discharged eough that the bike will crank slowly' - and 10 ma can be read by the cheapest of Radio Shack meters.</p><p></p><p>2. Batteries have internal resistance and suffer from what is known as 'self discharge'. However it takes more than 3 weeks for an automotive battery to self discharge.</p><p></p><p>3. No one suggested a short, per se. But 'crap' across the contacts of a switch can sometimes conduct enough to drain things without lighting them up enough to notice. - 23 ma at 12 volts is under a third of watt of draw.</p><p></p><p>This is one reason why navigators that have internal batteries must be wired to a switched source of power.</p><p></p><p>4. One battery reportedly drained in 2 hours - that means somethng more than 4 amps of drain (assuming a good battery) and THAT is somethng more than 48 watts.</p><p></p><p>5. The charging system has diodes in it and the leakage is normally low enough that the draw is less than the self-discharge rate of the battery itself - I suppose it is possible that a diode in the regulator pack is defective (I did ask about the charging system). But even so, the drain would be measurable, given the 'time to flat' reported by the owner.</p><p></p><p>6. The bike was a leftover 2005 model - the original battery may well have been toast (or close to it) when he took possession of the machine. But the replacement ought to have been good.</p></blockquote><p></p>
[QUOTE="bramfrank, post: 243166, member: 2163"] Don't take this the wrong way but . . . (in no particular order) 1. We have meters today that can measure microamps and instruments available that are orders of magnitude more sensitive - there really is no drain that can deplete a 12AH battery that is in good condition in 3 weeks that can't be measured. This translates into something like 23 milliamps to complete flat - about half that to 'discharged eough that the bike will crank slowly' - and 10 ma can be read by the cheapest of Radio Shack meters. 2. Batteries have internal resistance and suffer from what is known as 'self discharge'. However it takes more than 3 weeks for an automotive battery to self discharge. 3. No one suggested a short, per se. But 'crap' across the contacts of a switch can sometimes conduct enough to drain things without lighting them up enough to notice. - 23 ma at 12 volts is under a third of watt of draw. This is one reason why navigators that have internal batteries must be wired to a switched source of power. 4. One battery reportedly drained in 2 hours - that means somethng more than 4 amps of drain (assuming a good battery) and THAT is somethng more than 48 watts. 5. The charging system has diodes in it and the leakage is normally low enough that the draw is less than the self-discharge rate of the battery itself - I suppose it is possible that a diode in the regulator pack is defective (I did ask about the charging system). But even so, the drain would be measurable, given the 'time to flat' reported by the owner. 6. The bike was a leftover 2005 model - the original battery may well have been toast (or close to it) when he took possession of the machine. But the replacement ought to have been good. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Battery discharging whilst parked over 3 weeks. Is this normal?
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