1. Check if the battery is charging properly. If you have an ammeter, start the engine and measure the voltage between the positive and negative terminals of the battery. The voltage must be higher than 13V to be considered normal. If the charging voltage is found to be too low, a professional should check the charging system.

If you don't have a multimeter, you can visually inspect the battery: After starting the engine, open the battery filler cap and observe whether there are air bubbles in each cell. Under normal circumstances, bubbles will continuously rise from the water; the more oil there is, the faster the bubbles rise. If there are no bubbles, there may be a problem with the charging system. Note that hydrogen gas will be generated during the inspection, so do not smoke during the inspection to avoid explosion and fire.

2. Open the battery filler cap and check if the fluid level is normal. There are usually upper and lower limit markings on the side of the battery for your reference. If the fluid level is found to be below the lower limit mark, distilled water must be added. If distilled water is not readily available, filtered tap water can be used as an emergency measure. Do not overfill; the standard procedure is to add water to the middle position of the upper and lower limit markings.

3. Wipe the exterior of the battery with a damp cloth to remove dust, oil, white powder, and other contaminants that can cause leakage from the battery panel and stack. Regularly wiping the battery in this way can prevent white acidic powder from accumulating on the battery stack, thus extending the battery's lifespan.