bike battery power

[kingsknight]

So I have been planning my 2 weeks bike tour and I will be camping half of it so I decided to see how much battery power my bike holds before dying. So far I have charged my netbook, laptop and phone from completely dead to full charge and the bike still starts fine.

Even if I did drain the battery completely the bike is easily bumped started.

the standard battery on the XL seems pretty good.

Have any of you guys done a test like this before?
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TS50 (sold) NS125F (sold) NSR125R-K (write off after 2 crashes) CG125 (nicked) XR125L-3 (Sold )-: ) DR125SM '11 (sold yay) XL125V '12 (In love with this bike) XT600E '04 (fun on the dirt)

[kingsknight]

Charged my tablet from dead as well. Going to charge another phone from it. A side note. Seems to take longer charging from the bike then the power socket. Also I'm guessing bigger bikes have bigger batteries.
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TS50 (sold) NS125F (sold) NSR125R-K (write off after 2 crashes) CG125 (nicked) XR125L-3 (Sold )-: ) DR125SM '11 (sold yay) XL125V '12 (In love with this bike) XT600E '04 (fun on the dirt)

[Charlie]

If you could figure out how much power needed to crank over the engine then you could figure out how much extra power you've got left over to charge your various gadgets.

But if you aren't bothered about using the electric start then you could calculate it. Figure out the power needed to fully charge your laptop, phone, netbook (power (watts) = volts * amps). Then look at how much power your battery has.

However be aware this assumes a 100% efficient process, so it will actually use more. The best way would be to actually measure the current draw using a multimeter and then you could see how much power the chargers use. Be best if you could do an average for this as lithium batteries normally have a specific charging cycle where they alter the current depending on which stage of the cycle they are in. See this graph:

https://batteryuniversity.com/_img/content/ion1.jpg
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Past: Honda x8rs, Honda City fly, Honda Hornet 250, Honda VFR750, Yamaha xt600e.
Current: Honda CBR929RR & Yamaha XT660Z Tenere

[uberkron]

If you do this regularly you will ruin your battery. Id reccomend a seperate, even as small as 7ah sla battery that you charge while riding.

I once fitted a 17ah battery and a split charge relay to a scooter that was used for jump starting cars.

If its a once off youll be ok. My opinion of flooded bike batteries is that they are weak at best and rather poorly constructed.

Motobatt type batteries are more tolerant of cyclic use.
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i ride a zip 50 2smoke. It overtakes a hundred times a day.

[P.]

Just an aside, my Vara was "low" on battery, by low none of the lights came on, but the LED for grips was there.

Had to bump start, but have run it out totally and it wouldn't bump, doesn't even bother powering anything at all when you do so.

[andym]

I left the ignition lights on on my intruder overnight once, I couldn't bump it so I jumped it from the car, when I disconnected the lead from the car battery the bike carried on running, but I had no headlight, speedo or indicators for about 5-6 miles.

I've often thought about fitting a cigarette lighter socket to one of the bikes for phone charging and stuff

[UnspeedySam]

I've got a cigarette lighter socket on my bike. However I'm a little nervous of using my cheap chinese USB adapter for charging my phone etc, as I'm sure it's incredibly inefficient and will probably kill my battery.

I like the idea of a cheap secondary battery, but I'm not sure where I'd put it on the 6R...need to do some tests like this I think. I don't care if I kill the battery as it's old and a bit buggered anyway and I'm the KING OF BUMP STARTS. Since the TRX battery called it a day and I was bumping it twice a day for a week, I developed some real skill...850 twins are not easy to bump
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Riding: BMW R1150RT `02 bought mildly crashed
Fixing: Also the BMW as I get less broken bits
Gone: ZZR600 '00, TRX850 '97, RXS100 '93, JS125-6B '07, BMW R1100RS '93, Kawasaki ZX-6R-J2 '01, Honda Bros NT400 NC25 '88

[P.]

You can probably get an emergency battery setup, kinda like race stuff which is just 16 or so AA's.

Would be fine for bumping something like the vara that has an injection system. Would give it just enough juice to bump whenever.

[G]

Where possible I tried to charge while I was going - (while the 690 does have a bit bigger battery, starting a 650cc single takes a good bit more than starting a 125 twin!)
The devices would get charged in the day, generally giving me enough power to keep going for an evening.
I had wondered about having a second 'leisure' battery to run stuff from without the bike on, but never really found the need.

Quite likely a campsite will be ok for you to plug something in to charge in one of their buildings if need be.

[kingsknight]

Well I found the limit to my battery lol

Laptop
netbook
2xphones
TomTom XL
Took around 7 hours to charge that lot and it completely killed my battery to the point of no LED clock lights. The bike bumped with no problem at all. As soon as the bike was running everything was running like it had a full battery. Gave the bike a run for 15 miles and that seemed to charge the battery up loads.
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TS50 (sold) NS125F (sold) NSR125R-K (write off after 2 crashes) CG125 (nicked) XR125L-3 (Sold )-: ) DR125SM '11 (sold yay) XL125V '12 (In love with this bike) XT600E '04 (fun on the dirt)