5 Years ago, I designed and built a 12V battery based on cells sold at battery hookup. It's been running every day since October 17 2021. The cells are 3.2V 600mAh. I have a battery balancer attached to the cells which very rarely illuminates. The arrangement is 9 in parallel, 4 Series so 4S9P. It works great in winter and summer, no issues at all. If you are planning on doing something like this, you can definitely do it on your Prius. I cannot say the same for other cars. I would not jumper other cars from a battery like this either. But anyway, screw lead acid batteries, they never last 2 years in Washington State weather. Here I have proven that LifePo4 can do 5 years without any issues. The battery looks like new on the outside and on the inside. It changes fine and the car has not stalled or left me anywhere stranded since. Original post a the other place before I was banned for whatever stupid reason. https://www.reddit.com/r/prius/comments/qacx7w/im_testing_my_32650_12v_lifepo4_battery_after/
Lifep04 works great for things like this because they're very good at taking on a full charge without damage, compared to lead acid. The Prius in particular doesn't even need much of a 12v battery because it doesn't provide the power to start the engine. It just does the lights, ECU, and it flips a 12v relay to start the car engine, which the bigger hybrid battery cranks over.
Also, to my knowledge, all Prius since Gen 2 (like 2004-2009) don't come with a lead acid 12v battery and replacing one with a lead battery could cause you some warranty issues. If course, I'd imagine a home built battery could also cause a warranty issue. Lol
Really? I mean my Prius C is 2014. Its not lead acid. They use sealed lead acid batteries, which carry the current thru a gel. They are terrible in my experience. Any bubbling in the gel causes amperage loss.
You're right I was thinking for some reason AGM batteries weren't lead acid batteries, but they are.
oh you're well outside warranty already. go nuts.