SDMO RENTAL POWER R550C2 User And Maintenance Manual page 207

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• Charge batteries if they have become discharged.
During charging, unscrew the cell plugs but leave
them in the plug holes. Ventilate well, especially if
the batteries are charged in an enclosed space.
• If the engine is not used for a longer period of time,
the batteries should be fully charged, then possibly
trickle charged (please refer to the battery manu-
facturer's recommendations). Batteries are dam-
aged by being left discharged, and can also freeze
and burst easier in cold weather.
• Special instructions apply to boost charging. Boost
charging can shorten battery life, and should there-
fore be avoided.
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