Knowledge
12 May 2026

Procedure for Filling Electrolyte and Charging a Motorcycle Battery (For New Batteries)

Steps for Filling Electrolyte and Charging a Separate-Type Motorcycle Battery

1. Prepare the battery and the electrolyte pack supplied with the battery.
2. Remove the electrolyte container from the plastic bag. Then remove the sealing strip and keep it for sealing the battery later.For YTX dry-type batteries, use only the electrolyte container provided with the battery, as it contains the correct volume required, which directly affects battery life and performance.Note: Do not puncture or open the foil seal on the electrolyte container, and do not separate the container units.
3. Fill the electrolyte by placing the container upside down onto the filling ports, aligning it with all cells. Press down to break the foil seals.The electrolyte will automatically flow into the battery, and air bubbles may appear, which is normal.Caution: Ensure the container is placed upright and level at all times. Do not tilt the container during filling.
4. Check the electrolyte flow. Leave the container in place for at least 20 minutes or until it is completely empty.If there are no air bubbles or the electrolyte has not fully drained after 20 minutes, gently tap the container or battery to assist the flow.Caution: Do not remove the container until it is completely empty, as full filling is required for proper performance.

5. Carefully remove the empty electrolyte container. Then insert the sealing strip (removed earlier) into the filling ports and press firmly to ensure a tight seal on the top of the battery.

6. Let the battery stand after filling:- For batteries below 18 Ah: rest for 20–60 minutes- For batteries 18 Ah and above or high-performance models (marked “H”): rest for 1–2 hoursYou can check the Ah rating on the battery packaging.This resting period allows the electrolyte to fully absorb into the plates for optimal performance.
7. After filling, the battery will have approximately 75–80% charge. After resting as described in step 6, charge the battery to full capacity.Use a charger capable of charging at 12.8 volts or higher to ensure the battery is fully ready for use.
Charging MethodSTANDARD: Charge at approximately 10% of the battery capacity for 5–10 hours.QUICK:Charge at approximately 50% of the battery capacity for about 1 hour (suitable for new batteries).

Voltage Comparison Table: Battery Status and Recharge Time for Motorcycle Battery
YUASA BATTERY
YUASA BATTERY (THAILAND) PUBLIC COMPANY LIMITED 164 Moo 5 Soi Thedsaban 55, Sukhumvit Road, Tambol Taibanmai, Amphur Muangsamutprakarn, Samutprakarn 10280
Tel: 02-769-7300 Hotline: 02-702-0108 Fax: 02-769-7349
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