Servicing when replacing a Battery
1. Removing old batteries  
1. Pay attention to the positions and polarities of the battery terminals.
2. Disconnect the ground cable connector first.
3. Treat or replace any cables, connectors, or clamps that are corroded or damaged.
4. Remove, with a wire brush or hot water, any corrosion that has built-up where the terminals contact the connectors.
5. Store/dispose of the old battery safety in a safe place.
2. Installing a new battery
  
1. Remove any debris from the bottom of the battery and the battery carrier, and mount the battery securely.
2. If the battery is for motorcycle, make sure that the exhaust tube is not twisted, as it may restrict the flow, and that it doesn't come in contact with the chain or exhaust pipe.
3. Connect the ground cable connector last.
4. Never connect the cables backward.
5. After connection, thinly coat the metal parts of the battery connection with corrosion-preventative grease.
3. Electrical circuit check
Checking battery connections
1. Before starting the engine, give a final check to make sure that the connections are not backward or loose.
2. If the connections are OK, the needle on the vehicle's ammeter will fluctuate between " Discharge " and "-" when the ignition switch is turned on.

Checking the charge System ( Simple Method)
1. If the charge lamp goes out, the charge system is operating normally ( in cars with voltmeters, the needle should first fluctuate rapidly between " C " and " + ", and then drop back close to 0 within 5 seconds ).
2. If the charge lamp is still lit or the voltmeter needle indicates below 0, either the regulator voltage is set too low or the charge system is faulty. Check for loose battery connections and for a loose or slipping drive belt. If everything is normal, including the generator or regulator is not functioning properly, service them all.
3. If the voltmeter needle does not return to near 0 within 5 seconds and continues to fluctuate rapidly between " C " and " + ", the set voltage for the regulator is too high and must be readjusted ( this will also occur for batteries that are heavily discharged ).
4. Checking with a voltmeter or battery tester ( BT )
For a negative ( - ) ground vehicle
1. Make contact between the negative (-) BT lead and the vehicle's body or the engine, connect the positive ( + ) BT Lead to the positive ( + ) battery terminal.
2. Disconnect the negative (-) cable and connect positive (+) BT Lead in its place. Connect the negative (-) BT leads to the negative (-) battery terminal. If the terminal voltmeter reads 0V, the system is normal. If the voltmeter reads 12V, it indicates either a leak or faulty wiring.
5. Checking engine starting capacity
If the starter doesn't operate or revolution is sluggish
1. Contact with the terminal is faulty.
2. The starter is faulty.
3. A wire in the starting system is broken, a core wire is broken, or a connection is faulty.
4. The ignition switch is faulty.
If starter revolution is good, but the engine refuses to start, or if revolution becomes unstable, the ignition system is faulty.