Replacing Prius C 12v battery - better not to use a battery tender?

welcome!
i have never read that, but i just changed mine without one, and the only things i noticed was the loss of trip data, and the power window programming.

if i had a battery tender, charger, or any 12v source, i would have used it, because i'm really sad that i lost my lifetime trip data

 

Well... When you disconnect the 12v it's much like turning off your computer and rebooting it... And with a brand new battery a fresh start is what you're doing so you might as go all the way...

 

"Battery Tender" covers a lot of territory. I've used a rudimentary 1/2 amp trickle charger to retain memories, it worked fine, nothing bad. More recently I use a jump pack with a cable custom made for this purpose: it plugs into a cigaret lighter style socket on the jump pack, and the car's OBD port. It has indicator lights to indicate a good connection. I think in a pinch you could also use jumper cables running to another car's battery, as long as you can find somewhere stable to clamp the jumper cable, so they won't be knocked loose when you disconnect your battery.

Use caution, especially with makeshift methods: don't mix up positive and negative. Always hook up positive first, then negative, and the opposite when disconnecting.