Testing Your Battery For Sulfation With Your BatteryMINDer Battery Charger Maintainer Desulfator

The following, if done correctly, will tell you more about the condition of your battery than any "anecdotal" history ever would. Use a digital voltmeter and a temperature compensated (Floating Ball type or Gauge type) hydrometer for the testing, and a BatteryMINDer charger maintainer to avoid future problems with battery sulfation.

Testing a 12 Volt or 24 Volt Filler Cap Lead Acid Battery

Testing with a Temperature Compensated Hydrometer Tester

Specific Gravity - Capacity
Temperature Compensated Hydrometer
(Gauge type or Floating Ball type )
Full Capacity Percentage
1.270 (4 Balls floating) 100%
1.250 (3 Balls floating) 75%
1.190 (2 Balls floating) 50%
1.150 (1 Balls floating) 25%
1.120 (0 Balls floating) May denote shorted cell or battery that has been severely discharged and may not be recoverable 0%

Testing a Sealed, AGM or Flooded (Wet-cell) Lead Acid Battery Use a Digital Voltmeter Only

These batteries have no filler caps or manifold-type covers. Because you cannot gain access to the interior of your battery you cannot test it with a hydrometer.

Note: Do not expect to completely dissolve sulfate in a day. Long established sulfate will require a longer period to be fully dissolved. Be patient and you will rewarded with a "sulfate-free" battery.

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