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/
The final specs are basically: 12.8V, 691.2Wh, 54Ah. Its more than the Prius battery had previously except for the low amperage rating. The requirement for the Prius C is basically to click the main contacts on and to drive the air pump. Not much else runs from the 12V battery. Once the main battery is engaged all of the accessories are ran from the main battery. In the case that the main battery dies and you have the AC on and all the accessories running, this battery should be able to keep you power steering running for an hour, enough to safely stop the car and put it on park. Amazon has bigger beefier batteries. I’ve run this one for many days with the check hybrid system alert light on. Apparently when that light is on, the 12V system still runs from the main battery and not the little one. I drove from San Francisco to Seattle with that light on.
Does the Prius C main hybrid battery run the electrical starter for the hybrid gas engine then?
Yup, this little battery only turns on the electronics.
It also charges the 12V battery, the motor has no belts for any accessories and the transmission is CVT, but has no wearing parts.
Toyota was decades ahead of everyone on hybrids. 12 years ahead of F1.
You say the cells are 600 mAh each, 9 in parallel are 5.4 Ah, not 54 Ah. 5.4 Ah* (3.2 V * 4) = 69 Wh
Typo. 6000mah. Sorry about that.