The following guide provides instructions for preparing, filling, charging, and maintaining Yuasa batteries. These guidelines, provided by Yuasa Battery, apply to several battery types mentioned in the table below. Additionally, a table of specifications for these batteries, including voltage, capacity, charging current, and density of filling electrolyte, is included for reference.
|Volume Of Electrolyte|
(at 20 c)
|YB9(L)/ YB9A 12||12||9||0.9||0.6||1.28|
Preparation for Filling a New Yuasa Battery:
- Take the 6FF sealing tape and remove the vent plugs only right before filling the electrolyte.
- If your battery has a long-size exhaust tube, cut off its sealed end at about 3 cm (1 inch) from the tip.
- If your battery has a short-size sealing tube and is supplied with a separate long-size tube, pull off the short one and replace it with the long one.
- Fill the new battery with electrolyte (dilute sulfuric acid) with a density of 1.240 (1.260) for the tropical climate where the average temperature is more than 25°C (77°F), and 1.260 (1.280) for temperate climate.
- Fill to the UPPER LEVEL as indicated on the Yuasa battery.
- The electrolyte should be cooled below 30°C (86°F) before filling.
- Leave the battery standing for half an hour after filling.
- The electrolyte level may have fallen during the standing period, so refill the acid to the UPPER LEVEL.
- Figure 1 shows the specific gravity of electrolytes for Yumicron batteries.
- An initial charging is recommended before placing the Yuasa battery in service when time and equipment permit.
- Charge the battery with a current as described in the Table continuously for 16 to 20 hours.
- If the electrolyte level is found to fall after charging, fill DISTILLED WATER up to the UPPER LEVEL.
- After charging, place the vent plugs firmly, wash off the acid spillage with water, and dry the battery.
- Fasten the battery firmly to the vehicle.
- Be sure not to make a wrong connection between the battery’s positive and negative terminals.
- Do not fold or crimp the battery’s exhaust tube as it may cause an explosion if the tube is pinched.
- Check the electrolyte level once a month.
- If found lower than the middle of the UPPER and LOWER LEVEL, add distilled water to restore the level. Never use acid in this case.
- Keep the battery always clean and apply grease around the terminals to prevent corrosion.
- Keep the exhaust tube free of kinks and obstructions.
- Recharge the weak battery– when you find the lights get dim, the horn weak, and/or when you keep the battery unused for longer than one month.
- Charge the battery with a current as described in the Table.
- Charge until the battery starts gassing freely and the specific gravity of electrolyte rises higher than 1.240 in tropical and 1.260 in temperate climates.
- Many batteries contain a special chemical called SULFATE STOP that has been added to reduce sulfate crystal deposits that eventually prevent the battery from accepting a charge.
- SULFATE STOP, whose logo is printed with YUMICRON, is a white powder chemical that may be visible before the battery is activated but dissolves once electrolyte is added.
- After charging the battery (with SULFATE STOP added), the specific gravity of the electrolyte rises to 1.275-1.260.
- If the battery contains SULFATE STOP and has not been in use for a long period, extended recharging time is required.
- A logo identifying that SULFATE STOP has been added is visible on the front case below the acid level markings on your battery.