John Deere TY25864 User Manual download pdf (Page 14)

Controls and Operation

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Checking Battery State-of-Charge

TYK275 –UN–08OCT96

Checking State-of-Charge

A—Hydrometer

Use a voltmeter or hydrometer (A) to determine state-of

charge. Refer to chart to obtain percent of charge.

Voltmeter Reading Hydrometer Battery Test

Reading Reading

12 Volt Battery* Specific Gravity Percent of Charge

12.4 or greater 1.265 100%

12.39 to 12.25 1.225 75%

12.24 to 12.10 1.190 50%

12.09 to 11.96 1.155 25%

11.95 to 0 1.120 0%

* 6 volt battery voltmeter readings are one-half of 12 volt

battery readings shown.

CAUTION: Do NOT attempt to charge a frozen

battery.

NOTE: Any battery 25% charged or less may readily

freeze and should be charged at once.

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Identifying Battery Reserve Capacity (RC) Rating

Typical Group Sizes Auto, LGC, etc. 3ET, 47, 48, 49 31, 30H 1, 2 5D, 4 4D, 3EH, 8D

Reserve Capacity 80 or less 81-125 126-180 181-260 261 or more

Rating

Time needed to completely recharge a battery

depends on the battery’s electrical capacity and

present state of charge. Battery electrical reserve (RC

rating) is given in minutes, and is needed when

estimating recharge time.

Most batteries have a label attached showing the

battery’s type and/or reserve capacity rating. If this

information is not found on the battery, use the above

chart to determine reserve capacity (RC) rating.

10-3

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John Deere TY25864 User Manual Page 14