14. Hydrometer Testing The Batteries
• Minuteman batteries are rated for about 500 charge cycles. The life of
the battery will be greatly dependent by the maintenance they receive.
• Every time the batteries are charged it uses one cycle.
• The specific gravity will reflect the percentage of charge remaining in
the battery.
• 100% charge = 1.265 or higher Specific Gravity
• 75 % charge = 1.225 Specific Gravity
• 50 % charge = 1.190 Specific Gravity
• 25 % charge = 1.120 Specific Gravity
• Note : AGM & Gel maintenance free batteries can not be tested with
the hydrometer. Do not attempt to open cell covers or caps.
• Doing so will destroy the battery.
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