Honda EU3000is Owner's Manual page 56

Charging:
The battery is rated at 8 Ah (ampere-hours). Charging current should
equal 10% of the battery's ampere-hour rating. A battery charger
should be used that can be adjusted to deliver 0.8 amps.
The battery gives off explosive gasses; keep sparks, flames and
cigarettes away from the battery while charging. Provide adequate
ventilation when charging.
The battery contains sulfuric acid (electrolyte). Contact with skin or
eyes may cause severe burns. Wear protective clothing and a face
shield.
− If electrolyte gets on your skin, flush with water.
− If electrolyte gets in your eyes, flush with water for at least 15
minutes and call a physician immediately.
Electrolyte is poisonous.
− If swallowed, drink large quantities of water or milk and follow
with milk of magnesia or vegetable oil and call a physician.
Battery posts, terminals and related accessories contain lead and
lead compounds. Wash hands after handling.
KEEP OUT OF REACH OF CHILDREN.
1. Connect the battery charger following the manufacturer's
instructions.
2. Charge the battery 3 4 hours.
3. Clean the outside of the battery and the battery tray compartment
with a solution of baking soda and water.
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