Do not store your unit without performing protective storage maintenance which includes the following:
Turn power to unit off.
Remove battery.
Remove accumulation of dirt and debris from exterior of unit.
Tighten all screws and nuts.
Cover battery compartment, battery and charger.
Store unit in a dry, dust-free place out of the reach of children.
Remove battery.
Store in a dry, dust-free place, out of the reach of children.
Store in temperatures between -20o C (-4o F) and 60o C (140o F).
If battery is stored for longer than six months, charge it to 100% capacity.
Remove battery from charger.
Disconnect charger from power supply.
Store in a dry, dust-free place, out of the reach of children.