What are the dimensions of the original battery?
. . .
Original battery is 8"x3 .5"x6.5".
I found three Odyssey battery candidates:
- PC370 - 15Ahr - 7.9"x3.0"x5.5"
- PC545 - 13Ahr - 7.01"x3.38"x5.16"
- PC680 - 16Ahr - 7.25"x3.11"x7.55" , but 1" too tall
Some assembly is required which means inspecting the mounting location and using shims to make sure it is secure. You don't want ordinary road vibration to 'wear a hole' in the case. Also, short, jumpers may be needed to connect to the existing electrical connectors.
Finally, we want to monitor the 12V voltage through a couple of power cycles to make sure there are no surge loads that drop the voltage below 11.95V. For example, the Prius has a hydraulic accumulator pump that powers the brakes and there are other accessories that put a brief but significant load on the 12V battery:
- PC370 - 200 CCA - 425 PHCA (5 sec) - 15Ahr - ~$200
- PC545 - 150 CCA - 460 PHCA (5 sec) - 13Ahr - ~$100
- PC680 - 170 CCA - 520 PHCA (5 sec) - 16Ahr - ~$100
The easiest answer is the PC545, low cost and smallest size but also lowest capacity. PC680 would be the next IF there is enough head room. PC370 is strong and fits but expensive, nearly twice the price. But how good does the battery have to be?
I'll take a look this weekend at instrumenting the battery that was replaced in December. I can use a shunt resistor on the ground and B+ resistor network feeding an Arduino.