TM-9-2350-261-20-1 Unit Maintenance Manual Volume 1 M113A2 M577A2 M1064 M1068 M1059 M901A1 Download
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TM 9-2350-261-20-1 STE/ICE–R PROCED URE S (SIMPLIFIED TEST EQU IPMEN T F OR INTERNAL COMB USTION EN GINES REP ROGR AMMABLE) — Continued 0099 00 BATTERY TEST CARDS The STE/ICE–R battery test procedures allow the user to evaluate the condition and state of charge of carrier/equipment batteries. These procedures use the battery internal resistance and battery resistance change measurements. Battery internal resistance evaluates the state of charge of the battery. Battery resistance change evaluates the battery condition. Battery state of charge is a measure of the amount of energy stored in the battery. A fully charged battery contains the maximum amount of energy stored. If the battery fails the battery state of charge evaluation, the battery may be recharged to return the battery to full charge. The battery condition is a measure of the battery’s ability to accept and maintain a good charge. A battery in poor condition may be able to be fully recharged. However, a battery in poor condition with a full charge will lose its charge more quickly than a battery in good condition with a full charge. If a battery fails the battery condition evaluation, then the battery should be replaced. The procedures for testing batteries are listed on three battery test cards. Each card describes procedures for evaluating different combinations of batteries: •Complete battery pack •Series pair of batteries •Individual batteries BATTERY PACKS A battery pack is the combination of four or more batteries in a particular circuit of a carrier/equipment, i.e. the starting circuit. Testing the batteries in a pack evaluates the general condition of the pack as a whole. Note, the results of a battery pack test may be misleading. A single battery from a pack of four may be bad even though the pack as a whole may pass the tests. This can happen if the other three batteries in the pack are in very good condition. In order to test a battery pack, the current probe must be clamped around a single cable carrying all of the starter current. If such a connection cannot be made, then test each pair of batteries separately. SERIES PAIRS A series pair is one in which the negative terminal of one battery is connected by a cable to the positive terminal of another battery. This test configuration should be used when any of the following conditions exists: There are only two batteries (one series pair) in the carrier/equipment. An evaluation of the pack is desired, but the current probe cannot measure the total starter current. This condition can occur if the cable is not readily accessible or if the cable is physically too large. The battery pack test has failed, and the user wants to further identify any bad battery pair. NOTE Testing each series pair yields a better evaluation than testing the pack as a whole. INDIVIDUAL BATTERIES An individual battery test refers to the process of testing one battery at a time. The battery could be part of a pack, a series pair, or a single battery. Test the batteries individually if a battery series pair failed the tests and it is desired to isolate to a single battery (or if there is only one battery in the circuit). Testing individual batteries gives the best evaluation. 0099 00-11