Sorry but electricity does not evaporate. If power were flowing through the charger then a tiny amount may be lost as heat energy, but that would take years to discharge a bike battery.
How quickly does your battery go flat if you dont use the bike? 3 days?
- Thread starter rup5555555
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Sorry but electricity does not evaporate. If power were flowing through the charger then a tiny amount may be lost as heat energy, but that would take years to discharge a bike battery.
I was referring to the OE, not replacements.
I replaced mine with the Yuasa GYZ16H - 16Ah.
rup5555555
Registered user
Thats great - I was wondering if a 16Ah battery would fit, were the dimensions the same?
It didn't with one which was connected directly to a battery on a bike I bought.
The bike's battery went flat after a few days but removing the USB charger solved the problem hence my above comment.
Is there a setting on the tracker setup for them to power down with ignition off unless reactivated by movement?
Work bikes have telematics fitted, and the slow power down is enough for them not to start after a small number of days standing. Have to leave them plugged in on a trickle
Work bikes have telematics fitted, and the slow power down is enough for them not to start after a small number of days standing. Have to leave them plugged in on a trickle
It doesn’t evaporate, but a small current can flatten a relatively small battery in a short time. 200mA would flatten a 14Ah battery in 3 days. 100mA would take twice as long. 10mA is a tiny current (like one small LED) and would take about a month. Not years.
Yes. Whereas the original would be at around 12.6v after a few days, the new one will be at around 13.2v
Above refers to the Yuasa I fitted.
Not even directly connected. My usb was plugged into the Din socket and had the battery Flat in less than a week. The bike was new (to me) so assumed it was the battery, well because electricity doesn’t evaporate into thin air, right? Plus of course it has that fancy ‘canbus’ don’t it?
So returned the bike to my BMW dealer who kindly replaced the battery as a good will gesture (as they aren’t covered under the warranty).
One week later it was dead again. Removed the usb and it never went flat again.
Ergo electricity is fucking weird sometimes.
I thought GS 12v sockets switched off/de-energised a few minutes after the ignition is switched off?
happyjoe
Registered user
This got me thinking. My bike is now almost 4 years old with original battery.
It is always connected to the bmw charger when parked.
Should I change out to a new battery?
Yes I know batteries can last from 5 minutes to 5 years.
Any suggestions?
Sent from my iPad using Tapatalk
It is always connected to the bmw charger when parked.
Should I change out to a new battery?
Yes I know batteries can last from 5 minutes to 5 years.
Any suggestions?
Sent from my iPad using Tapatalk
At home mine is on charge when not in use (old habit from shitty alarms/trackers). I’ve just come back from well 3/52 (3 weeks ago) from an advanced bike course refresher in N Wales. My bike was parked up outside the B&B for a week, not on charge as not near a plug socket. Post course it started up first time. In the week I was scaring my self stupid it wasn’t touched or started.
My bike is a R1250GSA TE exclusive with factory alarm and tracker. I was a bit dubious (past Hx) about not starting, only because of previous Hx of alarms and trackers draining the battery, but I was proved wrong. The bike started first time
My bike is a R1250GSA TE exclusive with factory alarm and tracker. I was a bit dubious (past Hx) about not starting, only because of previous Hx of alarms and trackers draining the battery, but I was proved wrong. The bike started first time
Did you resolve this issue? Was it the batteries at fault or the bike?
rup5555555
Registered user
still testing the battery... my lithium battery is dropping aporox 0.04v a day which means it will take other ten days to get to 13v which, by all accounts, is a low lithium; then i will try and start it. The problem at the moment is i keep on riding the bike
. I think if it does start after 10 days then i’ll call it a success... time will tell.Deleted account 210609001
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My nephew has just been up to ride his 1,500-mile 1250GS that's been stuck in the garage untouched for three weeks. Started first time (as indeed it should do).
rup5555555
Registered user
still testing the battery... my lithium battery is dropping aporox 0.04v a day which means it will take other ten days to get to 13v which, by all accounts, is a low lithium; then i will try and start it. The problem at the moment is i keep on riding the bike
I have an update on this. I have measured the current draw on my battery over a 24hr period - it draws continuously 0.001Ah, so about 24mA a day. Therefore by my calculation it should drain 3.5A from a battery in 145 days, by which time a battery I should still (just) be able to crank the engine...
I'm not sure I'd like to rely on that.
So the basic equation is that Battery Life = Battery Capacity in Ah / Load Current in A. If your battery is 12Ah, a 1mA parasitic drain (which would be very very good by the way!), the battery life to being completely depleted would be 500 days. The problem is that the current draw might not be constant (particularly if there are any loads switching on and off- tracker, alarm etc), but mainly that the bike certainly won't start when the battery is completely depleted but probably won't start when it's partially depleted- and the battery state which is needed for a reliable start is unknown. The ability to start is a combination of the voltage under load and the internal resistance of the battery cells- both of which have a dependency on lifetime and how the battery is stored and operated. Temperature and self-discharge also comes into it.
I think from everything we're hearing, the battery specification is ok only if everything is good. Add on parasitic drains, cold weather, a batch of bad bad batteries, and all bets are off. As a result, mine's always on the CTEK if the bike's not being ridden for more than a handful of days.
rup5555555
Registered user
No, I'm not going to rely on it ; ) But I have logged the amps over a 24hour period, its 1mA +/- 0.2mA, so I'm calling it 1mA. Battery-wise I'm assuming 3.5A max usable before a fully charged battery gets to a state where it can't crank, I think this is a good rule of thumb on a good conditon 12Ah LAB, or a 4Ah Lithium.
rup5555555
Registered user
A bit of an update - the bike started first time after sitting for 2 weeks which was great news. My conclusion - 1 mAh drain seems acceptable if your battery is in good condition, the bike should start after months sitting; however if you turn the bike and play with the TFT and settings without starting the bike (or you briefly start the bike and not ride it to charge the battery) then this significantly drains the battery and, do it a few times, and you may get into the situation where the bike can't start, especially if your battery is sub optimal. All totally obvious I suppose, but sometimes the most obvious things manage to elude...
AberdeenAngus
Registered user
1mA is negligible. You'll be getting more than that through self-discharge within the battery itself.
rup5555555
Registered user
i did a quick back of fag packet calculation for my lithium- assuming 1% drop every 40 days, 1% of 4000mA is 40mA, so drop is 40/40 = 1mA a day, so 0.042mAh self discharge .
For a lead acid, assume 0.5% drop a day, 0.5% of 12000mA is 60mA, which is 2.5mAh self discharge. Which is indeed over 1mAh, much more than i expected.
