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Whats the smallest battery I can use for my bike?

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05FXST

Member
Im changing my 05 Standard into a bobber with a spring seat and got a new strutless fender. I have put the EMC with the battery and split the fuse harness. If I just had a smaller battery it would be great. Any suggestions?
 
Having a 2005 bike, if you do not have EFI or Alarm System, your need for full 250 CCA rated battery may be less. If you add a switch to the headlight or cutout relay to shut it off during cranking that would help as well. Since you still have electronic ignition, the voltage threshold during starting is still around 9-10V so do consider the current draw during starting (Reserve CCA) is still the controlling factor determining the battery size (almost 3x the 1100W stock starter draw).
 
Thanks!
I was talking to a guy today about a compact battery that a guy had started making on his own in Alaska and now he has his own production has anyone heard of that?
 
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