Battery sizing

[homer]

Want to keep my 7/13 weight low with a tight budget. I have a small and light 12v 3Ah battery and I was wondering will it be enough to crank my bike? It will be a track bike so ignition is only electrical thingy there.

 

[Arttu]

If it's a lead acid battery most likely it wont give enough cranking current. Depending on battery type and quality you will probably need something like 7-10Ah lead acid battery at minimum. Lithium (LiFePo4) batteries give more cranking current relative to their capacity so even 4Ah could be enough with them.

[Macduff]

And it will depend on how good a starter your engine is hot or cold. If its just a bit reluctant or tempermental a small capacity battery is just going to piss you off  as some point. Though you could get one of those jump starter boxes to cover off that problem.

 

[homer]

LiFePo4 would be nice but my efe need that more than this one. Have to test it will it be enough.

[suzook12]

You could fit an anderson plug to the bike so you can start from a remote battery, once running disconnect and go, assuming you are running an alternator of course....

[homer]

That is actually great idea. Just a small battery to keep the ignition running and remote one for starting.