Hammerhead R-150 Owner's Manual page 71

Battery
Battery Storage
Whenever the vehicle is not used for a period of three months or more,
remove the battery from the vehicle, ensure that it's fully charged, and
store it out of the sun in a cool, dry place. Check battery voltage each
month during storage and recharge as needed to maintain a full charge.
See page 78.
Tip: Battery charge can be maintained by using a Battery Tender charger or by
charging about once a month to make up for normal self-discharge. Battery
Tender can be left connected during the storage period, and will
automatically charge the battery if the voltage drops below a pre-
determined point. See page 90 for the part numbers of HAMMERHEAD
products.
Battery Charging
The following battery charging instructions apply only to the
installation of a sealed battery. Read all instructions before proceeding
with the installation of this battery.
The sealed battery is already filled with electrolyte and has been sealed
and fully charged at the factory. Never pry the sealing strip off or add
any other fluid to this battery.
The single most important thing about maintaining a sealed battery is to
keep it fully charged. Since the battery is sealed and the sealing strip
cannot be removed, you must use a voltmeter or multimeter to measure
DC voltage.
An overheated battery may explode, causing severe injury or death.
Always watch charging times carefully. Stop charging if the battery
becomes very warm to the touch. Allow it to cool before resuming
charging.
For a refresh charge, follow all instructions carefully.
1. Check the battery voltage with a voltmeter or multimeter. A fully
charged battery will register 12.8 V or higher.
2. If the voltage is less than 12.8 volts, recharge the battery at 1.2 amps
or less until battery voltage is 12.8.
Tip: When using an automatic charger, refer to the charger manufacturer's
instructions for recharging. When using a constant current charger, use the
guidelines on the next page for recharging.
MAINTENANCE
71