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Modern Car Battery Testers w\LCD - Accurate?
Swake:
Those small cheap electronic meters are reliable and precise enough that you can trust them. It is not possible to perform the same measurements with a multimeter alone.
The rules I apply for long lasting lead-acid batteries:
1/ Start with quality batteries, not the most expensive, and certainly not the cheapest. Actually the best thing you can do is to compare the weight (for same size) as it is a direct indicator of the thickness of the lead plates which is the 'wear' element.
2/ Never, NEVER !!, deplete more than 50%. After a big discharge always, ALWAYS!!, recharge within the next 24 hours, preferably with an slow electronic charger. 1 Ampere for a bike/quad battery, 5 A for a car battery, 10 A for a bigger traction battery). Ambient temperature. AGM/Gel batteries need a somewhat higher voltage. Don't use the big old heavy chargers, these are generally unregulated and not adapted to the batteries of the modern world.
3/ Winter storage: Do not use a trickle-charger or winter-charger continuously. Disconnect the battery unless you trust the vehicle will go to sleep mode and consume virtually nothing, then charge the battery to 100% with a slow electronic charger. Top-up the battery every couple of weeks (configure a reminder in the calendar of your phone).
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