Gel Battery drained flat, twice! - BMW Luxury Touring Community
 
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post #1 of 8 Old Nov 19th, 2006, 6:50 am Thread Starter
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Question Gel Battery drained flat, twice!

Two times I goofed, I left my GPS and radar detector powered up on the LT, without the battery tender plugged in.

The first time I did this I was impressed that the battery came back to full cranking power after being on the battery tender.

Well, I have done it again and the Battery Tender is working as I write here.
(And you don't need to tell me I need to get these accessories on a switched circuit. In spite of warnings to myself to not forget to unplug, I forgot. Yeah, I need to put this stuff on switched.)


Anyone done this before with the BMW Gel? What are the odds I'll need to go get a new battery?
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post #2 of 8 Old Nov 19th, 2006, 8:55 am
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Quote:
Originally Posted by CharlieVT
What are the odds I'll need to go get a new battery?
Probably not right away..but it definately shortens the life of a battery to do that.
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post #3 of 8 Old Nov 19th, 2006, 9:20 am
 
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Don't know if you'll need a new battery, but I can tell you that using a Battery Tender to revive a completely dead Gel battery is not the best tool for the job. I burned up a Battery Tender doing just that. What you really need to do is put that dead Gel battery on a 2A/10A battery charger and leave it connected over-night on the 2A setting.
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post #4 of 8 Old Nov 19th, 2006, 9:31 am
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Quote:
Originally Posted by CharlieVT
...(And you don't need to tell me I need to get these accessories on a switched circuit. In spite of warnings to myself to not forget to unplug, I forgot. Yeah, I need to put this stuff on switched.)
I want my Garmin on a non-switched, always powered source - On long trips I want to see ALL my times, running and stopped!

Quote:
Originally Posted by CharlieVT
Anyone done this before with the BMW Gel? What are the odds I'll need to go get a new battery?
If you were able to get the Battery Tender to engage...IE: show a Non-flashing red light at plug-in, there is enough poop in the battery that it should recover ok. The problem seems to be when you cross that line to extremely low voltage. Good luck!

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post #5 of 8 Old Nov 19th, 2006, 6:20 pm
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I've run my Odyssey totally flat at least 3 times now.

Joe's right on the money on the recovery plans - matches what Odyssey says on their web site as well.

Sucker keeps on going and going and going.


Yea, gotta put a relay in my farkle feed line.

Tate

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post #6 of 8 Old Nov 26th, 2006, 6:09 am Thread Starter
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It took a licking but it keeps on ticking.

Thanks for the replys, guys. Success!

The battery tender would not go into charge mode, so I plugged in an old el'cheapo trickle charger I have. It is a 12volt, requlated maxium 1 amp "trickle" charger. I hooked up a voltmeter to the battery just to make sure voltages never went too high; they didn't.

After one night on the trickle charger, I put the Battery Tender Plus back on it. After a couple of days the Battery Tender went in to maintenance mode. The BT got rather hot during this period so I unplugged it for a period to let it cool. The BT seems to have survived the ordeal; the battery seems to have survived too since it now cranks the bike right up.

I am aware that the battery has lost some of its life, but for now it is back. In my experience an old wet lead-acid would not have come back from this.
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post #7 of 8 Old Nov 26th, 2006, 2:56 pm
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Snip gotta put a relay in my farkle feed line

Hi , when I put a GPS ( I-way 500c )on my bike , I powered it up with a relay . I thought that way I wouldn't forget and leave it on .

But I didn't like it , if I wanted to play with the GPS , I had to either have the key on . So Then I'm setting there with the head light on , running the battery down . You really don't want to do that very long , as the ABS doesn't like a battery that isn't fully charged . ( Or I had to have the bike running , and I didn't like that either . )

Then when I start the bike the GPS would shut down ( I had used the power to the seat heater for the switch to the relay ) . So then I would need to start the GPS up again . It was a PIA
Hope this is of some help ...Patric ...

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post #8 of 8 Old Nov 26th, 2006, 7:56 pm
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Quote:
Originally Posted by messenger13
Don't know if you'll need a new battery, but I can tell you that using a Battery Tender to revive a completely dead Gel battery is not the best tool for the job. I burned up a Battery Tender doing just that. What you really need to do is put that dead Gel battery on a 2A/10A battery charger and leave it connected over-night on the 2A setting.
Joe is correct. The BMW gel charger will not event start the charge cycle if the battery is below a certain voltage. That's why a dumb charger would work better.

Just Go
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