https://www.amazon.com/Battery-Testers/b/ref=dp_bc_aui_C_4?ie=UTF8&node=15707371
There seem to be 2 main kinds.
The digital one seems to test CCA, etc.
The other kind has heat vents and does a load test.
Do you need both kinds?
Any tips on using a tool like this?
At what % do you replace a car...