Bike on battery tender, almost didn't start - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 38 Old 02-14-2019, 06:20 PM Thread Starter
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Bike on battery tender, almost didn't start

06 Wee, 15 days not ridden left on battery tender. Thought it would start up immediately, had trouble starting but I did get it to start, barely

What else could it be that would cause it to have trouble firing up?

The next morning resting voltage was 12.9
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post #2 of 38 Old 02-14-2019, 06:33 PM
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To zero in, did it crank and not run, did it crank slow, or did it not crank at all?
A Battery Tender is of no use if the battery cannot accept a charge, or provide full amperage capacity after being charged.
And "New" just means that--NEW, not necessarily good.
Ive had many tell me "The battery should be good, I charged it for 3 days." Means not a thing. It all starts--literally--with a good battery.
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post #3 of 38 Old 02-14-2019, 07:13 PM
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I second MAZ4ME's comments. Additionally:

If the engine was unusually cold, there could be no problem that will outlast the cold spell. If the cranking was significantly slower than usual, that would be consistent with extra amperage required due to increased oil viscosity. Or, if the engine was not particularly cold, slow cranking could indicate battery resistance having increased near to the "useless for starting" point.

Since you have a voltmeter and a battery tender connection, you can use for former, connected to the latter, to assess battery resistance. The voltage should not drop below 5-6 Volts during cranking. Going below that would indicate excessive battery resistance or an extremely cold engine. If it was quite cold, I suggest waiting for warmer conditions before trouble-shooting (or even worrying much.)
BTW, "excess battery resistance" is approximately equivalent to the "cannot ... provide full amperage capacity" that MAZ4ME mentioned.
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Last edited by Trepidator; 02-14-2019 at 07:17 PM. Reason: clarify
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post #4 of 38 Old 02-14-2019, 09:03 PM
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I had to move a bike out in the sun on a cold Flagstaff morning to get the bike warm enough. It was BMW though.
I've had the Wee Strom occasionally mis start on some mornings. Then I had to open the throttle to get it happy.
Mine usually show 12.4 12.6 at a rest.
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post #5 of 38 Old 02-14-2019, 09:56 PM
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My DR350 lives on a Cycle Gear branded battery tender-type maintainer. In the cold of winter it cranks slow & won't start when I try. I sit my Mr Buddy propane heater under the engine for 10 minutes & it'll fire right up. This with 10W-40 oil.
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post #6 of 38 Old 02-14-2019, 10:58 PM
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Any chance you have a LiPo battery?
They need to be warmed up before starting.
Turn the ignition on and let it sit like that for 5 mins.

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post #7 of 38 Old 02-15-2019, 12:53 AM
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Quote:
Originally Posted by Trepidator View Post
I second MAZ4ME's comments. Additionally:

If the engine was unusually cold, there could be no problem that will outlast the cold spell. If the cranking was significantly slower than usual, that would be consistent with extra amperage required due to increased oil viscosity. Or, if the engine was not particularly cold, slow cranking could indicate battery resistance having increased near to the "useless for starting" point.

Since you have a voltmeter and a battery tender connection, you can use for former, connected to the latter, to assess battery resistance. The voltage should not drop below 5-6 Volts during cranking. Going below that would indicate excessive battery resistance or an extremely cold engine. If it was quite cold, I suggest waiting for warmer conditions before trouble-shooting (or even worrying much.)
BTW, "excess battery resistance" is approximately equivalent to the "cannot ... provide full amperage capacity" that MAZ4ME mentioned.
Trepidator the minimum accepted cranking voltage for an injected is 10.0 VDC for 15 seconds at room temp, 9.5VDC for a carbureted engine for 15 seconds. I havent seen a 12V starting system that would crank an engine at 5-6 volts.
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post #8 of 38 Old 02-15-2019, 04:09 AM
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12.9V is perfect, sounds like a full charged battery. Did it crank strong and normal? If so you don’t have to worry about the battery.
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post #9 of 38 Old 02-15-2019, 04:25 AM
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Quote:
Originally Posted by MAZ4ME View Post
Trepidator the minimum accepted cranking voltage for an injected is 10.0 VDC for 15 seconds at room temp, 9.5VDC for a carbureted engine for 15 seconds. I havent seen a 12V starting system that would crank an engine at 5-6 volts.
At room temperature, (or typical heated garage or shop temperature), less voltage drop during cranking should be expected. But those are ideal conditions, where the starter motor can approach its unloaded RPM and draw much less current than is needed during cold conditions.

A better assessment of battery resistance is how much the battery voltage drops when the headlights are on versus off, or at high-beam flash (all filaments driven) versus off or low beam. That is a more repeatable load than cranking voltage. It would be useful to have figures for those drops with the V-Strom.

When I get back to mine, I will take a look at cold-cranking voltage and headlight load drop for a battery near its end-of-useful-life. (I know it's getting there because, after 5+ years of use on its first battery, most of it commuting, cranking has gotten sluggish on colder days.)
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post #10 of 38 Old 02-15-2019, 12:37 PM
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"cranking has gotten sluggish on colder days.)"

Mine did similarly and it was 7-8 years old. Not dead but acting like a wounded senior citizen. It was a Walmart Everstart.
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