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 Battery woes

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motor-timothy
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PostSubject: Battery woes   Battery woes Icon_minitime1Sun Nov 15, 2020 3:38 am

After leaving the bike with a fully charged lithium battery for 17 days as I was hospitalized (all well now) I found the GRiSO with its battery completely dead. I thought it odd as with its normal drain the battery should have lasted at least 3 weeks. I figured, my mistake and ordered a new lithium battery. Now I should have tested the electrics first, but I didn't as I just assumed 17 days had just been a little too long for the battery.
So got my new battery, rode a day all well, parked the bike for the weekend. 3 days later I went to work, new battery completely dead (as in 1volt). Thankfully I was able to revive it after some effort (lithium loader refused to recognize it, so I used a conventional loader to get it to 7 volts and then the lithium loader was able to charge it) but it made me realize there must be some issue with the bike's electrics. Since then I've been pulling both main fuses after every ride just in case until I have time to investigate and that has worked flawlessly

I'll start eliminating things this afternoon, but before I start any usual wiring suspects that can discharge a battery this fast?
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rick pope
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Sun Nov 15, 2020 4:59 am

Perhaps I'm crazy, but here's an idea...... Whatever is draining your battery that fast has to be putting out some heat. Many new phones/devices have thermal imaging as a function in the cameras. Might this be a tool to search out a current draw? I've never tried it, but it seems logical, to a dumb ol' farm boy.

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lcjohnny
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Sun Nov 15, 2020 6:34 am

Have you got a usb socket wired in?
These have transformers (some are surprisingly high current draw)
if you have one it must be switched off or it will flat your batteries
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motor-timothy
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Sun Nov 15, 2020 8:17 am

rick pope wrote:
Perhaps I'm crazy, but here's an idea......  Whatever is draining your battery that fast has to be putting out some heat.  Many new phones/devices have thermal imaging as a function in the cameras.  Might this be a tool to search out a current draw?  I've never tried it, but it seems logical, to a dumb ol' farm boy.

That's an interesting idea but relies on A: a drain that happens continuously or regularly. If its something that draws a lot of power at random you'd have to watch the bike for maybe days before it happens. B: a drain that is so significant that it actually shows on thermal imaging. C: I'd actually have to have a thermal imaging device in the first place.
So I don't know if it will really provide much benefit over simply eliminating things one by one with a multimeter.

I suspect the drain is parasitic in nature as with the main fuses in the battery shows 13.23V and with the fuses pulled it shows 13.41V indicating something is drawing power. I'll figure it out. Unfortunately today it has been torrential rains for the entire day and I have to service the bike outside without shelter, so really couldn't do any electric-related stuff apart from that quick test. I did test the charging system which is fine thankfully.
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Kiwi_Roy
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Sun Nov 15, 2020 10:00 pm

This might help.
Look for anything non-standard and start from there.
USB chargers etc etc
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Bulldog9
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Mon Nov 16, 2020 7:19 am

If you have a volt meter that can measure amperage, you can pull each switched fuse and measure across the connectors to see if there is any amperage flowing. This may help to track down what circuit may be bleeding the battery down.
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Gaucho
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Mon Nov 16, 2020 7:30 am

Good morning,
You need to measure KOBD (key off battery drain), take a digital multimeter with capacity to measure 10 A DC, disconnect the battery positive cable and connect the multimeter in series. Look at your reading, if you have more than 0.030 A there is something causing an abnormal drain.
If that's the case, start to remove the fuses one by one and look at the readings, when the reading drops that's the circuit that is causing the drain. Identify the components in that circuit, re install the fuse and start disconnecting the components one by one looking at the multimeter readings. When you disconnect a component and the reading goes down, you've found it.
DO NOT TURN THE KEY ON WHEN PERFORMING THIS TEST. There is a reason why is called "key off" battery drain test.
Gaucho

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avgpetro
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Wed Nov 18, 2020 4:35 am

The dasboard software has a bug that will appear randomly and couse the battery to die

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motor-timothy
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Wed Nov 18, 2020 10:30 am

Well I did some testing but found nothing out of the ordinary. Charging system voltage is good, and amp draw looks allright too: initially a 5 seconds or so 150mA drain when the ECU boots up, and then an absolutely normal 2mA drain with spikes to 2.5mA whenever the dash led blinks.
This leaves me puzzled how the batteries drained so fast. It was raining heavily the entire week when it happened, but I assume any short due to water that could drain the entire battery would result in a burned fuse no? Perhaps I should redo the amp draw test while throwing buckets of water over the GRiSO 🙈

avgpetro wrote:
The dasboard software has a bug that will appear randomly and couse the battery to die

[You must be registered and logged in to see this link.]

Well that's annoying. Hoe exactly does this work? I.e. in my example I installed the new battery (without doing the key thing fix listed in that topic) then went for a ride, went back home 8 hours later, parked the bike and left it for a couple of days -> dead battery. Could that be caused by that bug?
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avgpetro
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PostSubject: Re: Battery woes   Battery woes Icon_minitime1Mon Nov 30, 2020 6:55 am

motor-timothy wrote:
Well that's annoying. Hoe exactly does this work? I.e. in my example I installed the new battery (without doing the key thing fix listed in that topic) then went for a ride, went back home 8 hours later, parked the bike and left it for a couple of days -> dead battery. Could that be caused by that bug?

Its random. It may happen, it may not happen. Everytime, or never, or often, or rarely.
For me, the key thing is a standard procedure.

It may have nothing to do with the actual problem you're facing, its an easy, cost free solution - the kind I love.
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