Honda EU70is Manuel De L'utilisateur page 68

Battery Charging
The battery is rated at 11.2 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 1.1 amps.
1.Connect the battery charger following the manufacturer's
instructions.
2.Charge the battery 5–10 hours.
3.Clean the outside of the battery and the battery compartment with a
solution of baking soda and water.
Battery Installation
1.Install the battery into the generator.
2.Connect the positive (+) cable to the battery positive (+) 
terminal first, and tighten the bolt securely.
3.Slide the battery boot over the positive (+) cable and terminal.
4.Connect the negative (–) cable to the battery negative (–) 
terminal, and tighten the bolt securely.
5.Install the battery strap.
6.Install the battery maintenance cover in the reverse order of removal
(see page 63).
Never operate the generator with the battery maintenance cover
open, as poor engine and generator performance will result.
SERVICING YOUR GENERATOR
The battery gives off explosive
hydrogen gas during normal
operation.
A spark or flame can cause the
battery to explode with enough
force to kill or seriously hurt you.
Wear protective clothing and a face
shield, or have a skilled mechanic
perform the battery maintenance.
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