A plain voltmeter does not give you an accurate indication of the overall condition of the car battery. You must have a DMM w/ MIN/MAX function for that purpose.
I have a battery tester that can display the SOC (state of charge) and SOH (state of health) values of the battery and used it to check my stock battery from time to time when my battery reached 3+ years old.
https://www.amazon.com/BA5-100-1200-.../dp/B0017R5EQK
I've also used a 7-stage automatic battery charger w/ recondition function..
You may have 100% SOC but if your SOH value drops to lower than 70% .. not much can be done to improve the value .. it indicates your battery has deteriorated and needs a replacement.
At present, in lieu of a DMM w/ MIN/MAX function, I have a BM2 monitor hooked up to the battery.
You can monitor the battery condition thru an Android app.
Originally Posted by Mitz
A plain voltmeter does not give you an accurate indication of the overall condition of the car battery. You must have a DMM w/ MIN/MAX function for that purpose.
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