Sp gravity touches 1000 what to do!?Like ·  · Follow Post · Share · 20 hours ago

Yawan Kumar Tanwar SPECIFIC GRAVITYSpecific gravity means exact weight. A "Hydrometer" or a "Refractometer" compares theexact weight of electrolyte with that of water. Strong electrolyte in a charged battery is heavierthan weak electrolyte in a discharged battery. By weight, the electrolyte in a fully chargedbattery is about 36% acid and 64% water. The specific gravity of water is 1.000. The acid is1.835 times heavier than water, so its specific gravity is 1.835. The electrolyte mixture ofwater and acid has a specific gravity of 1.270, usually stated as "twelve and seventy."

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Yawan Kumar Tanwar SPECIFIC GRAVITY READINGSBy measuring the specific gravity of the electrolyte, you can tell if the battery is fully charged,requires charging, or must be replaced. It can tell you if the battery is sufficiently charged fora capacity (heavy-load) test. The battery must be at least 75% charged to perform a heavyload test. (The heavy load test will be discussed later). In other words, each cell must have aspecific gravity of 1.230 or higher to proceed.CELL READINGS PERCENT CHARGED1.270 100 %1.230 75%1.190 50%1.145 25%1.100 0%If the battery is less than 75% charged, it must be fully recharged before proceeding. If thebattery is 75% or higher proceed to a heavy load test. A battery not sufficiently charged willfail because it is discharged.

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Yawan Kumar Tanwar SPECIFIC GRAVITY - EXCESSIVE CELL VARIATION READINGSVariation in specific gravity among cells cannot vary more than 0.050. The variance is thedifference between the lowest cell and the highest cell. A battery must be condemned forexcessive cell variation if more that 0.050. In the example below, the highest SG reading iscell #1 (shown in green) while the lowest SG reading is cell #5 (shown in blue); the differenceis 0.070 which requires battery replacement. Cell #5 if failing.Cell #1 Cell #2 Cell #3 Cell #4 Cell #5 Cell #61.260 1.230 1.240 1.220 1.190 1.250Many factors contribute to cell variation; for example, if water was just added to that cell, thecell is then diluted with water resulting is a lower specific gravity reading. Recharging thebattery would correct this false reading. In some cases if a battery that has cell variationslightly over the specification and is only about 50% charge, charging the battery at a slowrate of charge (5A) may reduce the cell variation, thus saving the battery.

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