I bought one of those inexpensive battery load testers off Amazon, to check my battery life (and my other cars too since they are sitting idle with the current pandemic issue). After some difficulty getting to the terminals and making sure car was in 'sleep' mode, here are the numbers ( 2015 Rex, original battery) :
SOH - state of health: 50%
SOC - state of charge: 85%
RES - Internal resistance : 16.71
Volts- 12.48
CCA, measured/ Rated: 148/300 ( used DEKA AUX 18 L specs)
Has anyone tried this, and if so, anyone know or have experience with AGM batteries as to what is the minimum values before battery should be changed? Only thing I found was best if changed if SOH < 40%. Nothing to indicate any problem with the battery so far ( strange faults, etc.) I will likely change the battery in the next 6-12 months in any case, but it would be cool to try and do measurement/metric based maintenance vs shotgun approach...