Note. If the battery is almost fully flat, when the starting button "" is pressed, the starting relay will issue a vibrating noise.
Do not remove the battery plugs: without plugs the battery may be damaged.
Remove the battery, see 7.2.1.
Remove plugs.
Check the battery electrolyte level, see 2.4.3.
Connect the battery with a battery charger.
Recharge the battery with 1/10th of its amperage.
Once finished, check the electrolyte level once more and, if necessary, top up using distilled water.
Refit battery plugs.
Warning! Reassemble the battery only 5 to 10 minutes after disconnecting the recharge apparatus, since the battery continues to produce gas for a short lapse of time.