Thanks for the replys. I'm not even close to knowing much about figuring electrical stuff, but is there
a way to tell if a certain bike will charge a certain battery and how long?

I've got a motorcycle camping trip coming up in May. Probably 8 or 9 nights of tent camping with no power. Our camping will be boondocking in tents. I'm willing to buy a Z1 or Transcend Cpap and a supporting battery, but I'm concerned about fully charging the battery each day from my bikes cig charg...