Chris-CJ
Well-known member
As GG says, the performance under load is a better marker than the voltage reading of the battery.Then I guess you don't have one. Simple device, uses a wire that heats up to load the battery with 100A or so and an analog volt meter so you can see how the battery holds up under load.
I am no expert, but these are the basics that as an ex-Marine Engg that I remember.
Volts = the pressure pushing the electric current.
Watts = the power it takes for the battery to actually do something i.e. moving the "load".
Amperage = the strength of the electric current. The larger the amperage, the more electricity can flow through the circuit.
(Am open to correction, the above explanation was dragged out from class memories of many moons ago)