Schumacher TB4 - Manual (Page 6)

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2.14 Do not charge the battery upside down. The battery must be
upright while charging.
2.15 The battery must be handled by adults only. The battery is heavy
and contains sulfuric acid (electrolyte). Dropping the battery could
result in serious injury.
3. GETTING STARTED
MAKE SURE YOU HAVE
THE CORRECT BATTERY/CONNECTOR
COMBINATION. MATCH THE PICTURE
SHOWN WITH THE VEHICLE’S
CONNECTOR AND CONFIRM YOU
HAVE THE CORRECT MODEL BATTERY.
DO NOT MODIFY THE CONNECTOR
OR WIRING HARNESS ON THE BATTERY OR VEHICLE OR IT
COULD RESULT IN AN ELECTRIC SHOCK OR FIRE.
4. CHARGING THE NEW BATTERY
IMPORTANT: CHARGE THE BATTERY IMMEDIATELY AFTER
PURCHASE, AFTER EACH USE, AND EVERY 30 DAYS WHEN
NOT BEING USED, TO KEEP THE BATTERY FULLY CHARGED.
4.1 Before first time use, charge the battery for at least 18 hours.
Never charge the battery longer than 30 hours.
4.2 Plug the correct connector into the battery.
4.3 Plug the charger into a standard 120 volt wall outlet.
4.4 Charge the battery until the charger indicates “Ready for Use” or
“Full” charge (see charger manual).
NOTE: For maximum battery life, charge the battery to 100%
(Full) every third charge (e.g. quick, quick, full) and at the end of
each use of the vehicle.
4.5 When the battery is charged, unplug the charger from the wall outlet.
4.6 Disconnect the battery from the charger.
4.7 Install the battery into the vehicle (see Battery Replacement section).
Batteries can fall out and injure a child if the vehicle
tips over. Always be sure the battery is properly installed after
charging or replacement and prior to use of the vehicle.