Battery drain? - Page 2 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #11 of 21 Old 07-15-2015, 06:12 PM Thread Starter
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Originally Posted by cbrlocal View Post
Seems a little low at idle. Unless of course the battery is a little low. It should be around 13-13.2 fully charged. Charging voltages aren't specified for a particular range, but ~13 for the fully charged battery (and assuming around there at idle), and a maximum charging voltage of 15.5V at 5k RPM. Sounds like the battery just needs a bit of a charge.
It's been sitting for 2 months off a tender and the only chance it had to charge was my 5 min ride so could be low.

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post #12 of 21 Old 07-15-2015, 06:22 PM
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The voltmeter could be off as well, quality on the tools is certainly going down unless you're talking a Fluke or other high end unit. The checks are battery with engine off, then voltage at batt at 3k - 5krpm. If you're seeing a 1.7 to 2v difference, you're in the range of being good. That's a ballpark, highbeams, electric clothing, aux lights, etc can lower that a bit.

It's best for the battery to let it sit on the tender when not in use.

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Current stable: '72 GT750, '74 GT750x2, '75 GT750, '82 MB-5, '85 CMX250CD, '12 CBR250R, '14 Spyder RT-S
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post #13 of 21 Old 07-15-2015, 06:31 PM Thread Starter
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Originally Posted by Smokerider View Post
The voltmeter could be off as well, quality on the tools is certainly going down unless you're talking a Fluke or other high end unit. The checks are battery with engine off, then voltage at batt at 3k - 5krpm. If you're seeing a 1.7 to 2v difference, you're in the range of being good. That's a ballpark, highbeams, electric clothing, aux lights, etc can lower that a bit.

It's best for the battery to let it sit on the tender when not in use.
Thanks, than my readings sound about right. I was using a 3 year old volt meter (only tells volts) I got off ebay. So could be off for all I know.

I really didn't have much say in how it was stored because of my accident. I'm just thankful it was in a safe place rather than it sitting outside my apartment for those 2 months.

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post #14 of 21 Old 07-19-2015, 07:25 PM Thread Starter
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Bike was working fine for 3 days than battery died. I think I have a loose wire or a short somewhere. Can anyone point me in a direction to look?

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post #15 of 21 Old 07-19-2015, 10:28 PM
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Check your grounds and your voltage regulator. Start with the battery connections and moving outwards, looking for any part of the circuit pulling current with the key off.
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post #16 of 21 Old 07-19-2015, 11:22 PM
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I've been almost actively trying to kill my (2012) battery and haven't. I've not put a tender on it once (Chicago winters ), and I've left the lights on over night at least 4-5 times, push start it and it's fine; holds a charge right away. Not sure if mine is a fluke, but I'm imagining it doesn't take much to turn over that little 250, so the OEM battery is probably overkill. I'd think the batteries should last fine through a few deep discharges fine...which means I can't justify a LI-ION
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post #17 of 21 Old 07-24-2015, 01:56 PM Thread Starter
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Dead/dying stator. Not charging plus the resistance on the plug was all over the place.
And readings were fine for the r/r according to the shop manual.
Unless anyone tells me otherwise I'm going with the stator.

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post #18 of 21 Old 07-24-2015, 02:57 PM
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I had a GPS wired directly to the battery and it drained it completely. I now have it on a switched circuit and haven't had a problem since.
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post #19 of 21 Old 07-25-2015, 09:42 AM Thread Starter
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I had a GPS wired directly to the battery and it drained it completely. I now have it on a switched circuit and haven't had a problem since.
Current leakage was fine plus nothing is hooked up to the battery expect the bike.

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post #20 of 21 Old 07-25-2015, 08:19 PM
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i also left key in o'night 2 or 3 times in 3 yrs
clutch starting each time - and for a few days
to avoid stress til charged - resulting in full
or functional one press starts every time..
no battery tender or charger.. [no testing]
all she ever has was daily riding..
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