Battery not holding a charge? Or something else? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 11 Old 06-21-2010, 01:23 PM Thread Starter
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Battery not holding a charge? Or something else?

About 5 weeks ago I left my GPS plugged in to my non-switched 12V plug for 4 or 5 days. Went to start the bike and the battery was dead. No surprises there, no issue.

Next I left my heated grips on (they are wired direct to battery). Dead bike. OK, my fault.

I haven't noticed the issue again until...

Last week I installed the following:
-USB charger for my iPhone/iPod (PC8 switched)
-2x 55w H4 aux lights (PC8 switched)
-Eastern Beaver H4 relay kit for the main lights
-Eastern Beaver PC8
-12v lighter adapter under the seat where my GPS stays plugged in. I unplug the GPS from the charger, but the charger stays plugged into the lighter socket. (PC8 non switched)

Now it seems as though the batterry won't hold a charge for more than 2 days...
I need to boost it in the morning, but by the time I get to work (40km) it will start on its own. It's fine at the end of the day, but I am now carrying booster cables with me everywhere I go.

I'm thinking I may have shorted something somewhere, but all of the accessories and sockets work as they are supposed to...

I followed the instructions for the H4 relay kit, but I'm not 100% convinced, as it seemed too easy.

What sayeth the collective? Is the battery charging but not keeping the charge? Or is it not getting charged properly?

The first guy on the block with a 2010 white V-Strom
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post #2 of 11 Old 06-21-2010, 01:47 PM
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Draining a battery completely (twice) is a good way to damage a battery permanently. If your charging voltage is ok and you don't have any shorts or electrical components that drain the battery I'd suspect the battery being bad.

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post #3 of 11 Old 06-21-2010, 01:53 PM
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Yep. Deep discharging kills the battery's capacity and, consequently, it's ability to deliver juice.

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post #4 of 11 Old 06-21-2010, 01:53 PM
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Try disconnecting all your extra stuff. If the battery holds the charge, then re-connect one thing at a time looking for the trouble maker.

And, be sure you get the battery fully charged. If the voltage is at least 12.6 volts after resting a couple of hours following charging, it is fully charged.

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post #5 of 11 Old 06-21-2010, 02:26 PM
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Quote:
-12v lighter adapter under the seat where my GPS stays plugged in. I unplug the GPS from the charger, but the charger stays plugged into the lighter socket. (PC8 non switched)
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Originally Posted by PTRider View Post
Try disconnecting all your extra stuff. If the battery holds the charge, then re-connect one thing at a time looking for the trouble maker.
... I'd start with just keeping the GPS charger unplugged.
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post #6 of 11 Old 06-21-2010, 07:43 PM Thread Starter
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... I'd start with just keeping the GPS charger unplugged.
I have now made the 12v socket in the under seat tray a switched circuit...I will see how everything goes and change the battery if required.

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post #7 of 11 Old 06-21-2010, 08:22 PM
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If you read the answers from the previous posts, and believe what you have read you will have the solution. If you take a brand new lead acid maintenance free battery (like you have in your bike) and charge it properly, and then discharge it completely twice, you have ruined that battery. It will not likely ever accept a 100% charge. The best you can do is charge it with one of the following batt. chargers. Battery Mate, Tech Mate, Opti Mate, Accu Mate Etc Mate. These little batteries struggle to survive in a bike to begin with, and then we proceed to load them down with all kind of accessories. You may need to charge it for 5 hours, and you may need to let it sit for a few days to see if it holds the charge (12.5v) You may need to put it on the charger 3-4 times to get it to take 85-90% charge. You may need to buy a new battery.

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post #8 of 11 Old 06-21-2010, 08:37 PM
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Originally Posted by PTRider View Post
If the voltage is at least 12.6 volts after resting a couple of hours following charging, it is fully charged.
Which is actually a totally meaningless measurement.
The voltage is okay but that will not indicate the batteries ability to support a load. More than likely as soon as you put a load on it the battery will fail.
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post #9 of 11 Old 06-21-2010, 11:27 PM
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Which is actually a totally meaningless measurement.
The voltage is okay but that will not indicate the batteries ability to support a load. More than likely as soon as you put a load on it the battery will fail.
Entirely possible. My point is that the battery much be recharged long enough to get to full charge to begin testing. Only then will the OP know if the battery is indeed DOA or if a parasitic load is dragging it down.

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post #10 of 11 Old 06-22-2010, 12:48 AM
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parasitic draws are very rare, it's usually just a bad batter. Chuff up the change and get a new juice box....and a battery minder charger thingie, if you keep all those "APPS" running all the time....

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