Toyota 28800-21181 Battery

For 2004 through 2009 models, first, remove the surface charge from the battery by turning on the high beams for ten seconds, then turning them off and letting the vehicle stand for two minutes. Next, check the battery state of charge by visually inspecting the indicator eye; if clear, charge the battery. Perform an open voltage circuit test with a digital voltmeter, ensuring the voltage is 12.6 volts or more before proceeding to a load test using a battery load-testing tool, maintaining the load for 15 seconds and ensuring the voltage does not drop below 9.6 volts. For replacement, open the rear hatch, lift the cargo area cover, and remove the luggage storage box. The battery is under a cover on the right side; remove this cover, disconnect the power supply connector and module, and then disconnect the wiring harness from the plastic duct before removing the duct. For 2009 and earlier models, disconnect the negative battery terminal first, then the positive, and remove the battery hold-down clamp before lifting the battery out. Inspect the tray and fasteners for corrosion, cleaning any affected areas with a baking soda/water solution and repainting as necessary. Ensure the replacement battery matches the original specifications and is fully charged before installation, which should be done in reverse order, connecting the positive cable first. After connecting the cables, apply a light coating of battery terminal corrosion inhibitor. Finally, initialize the power window system by turning the ignition on, raising the driver's window halfway, closing it completely while holding the switch for at least a second, and checking the UP and DOWN operations. If they do not work, disconnect and reconnect the battery to start the process again.

A routine preventive maintenance program is essential for the battery in your vehicle to ensure quick and reliable starts. Before performing any battery maintenance, make sure you have the proper equipment for safety. Take precautions when servicing the battery, such as turning off the engine and disconnecting the cable from the negative terminal. The battery produces flammable and explosive hydrogen gas, so avoid creating sparks or lighting matches near it and charge it in a ventilated area. The electrolyte contains poisonous and corrosive sulfuric acid, so avoid contact with eyes, skin, or clothes, and wear protective safety glasses. Check the external condition of the battery for any corrosion, loose connections, cracks, or loose hold-down clamps. If corrosion is present, remove the battery for cleaning. Clean the cable clamps, terminals, and battery case with a solution of warm water and baking soda, taking care not to let the solution enter the battery. Ensure the battery tray is in good condition and the hold-down fasteners are tight. For charging, a slow-rate charger is recommended, such as a one or two-amp battery charger. Avoid using a quick-charge system. The average time to charge a battery depends on the charger. Corrosion can be removed with a water and baking soda solution, and any damaged metal parts should be covered with a zinc-based primer and painted.