Quick Charge NPEXU - Manual (Page 5)

Do not over discharge batteries. Excessive discharge can cause
polarity reversal of individual cells resulting in complete battery
failure. Re-charge batteries as soon as possible after a deep
discharge, but not if they are warm, allow a cooling down period.
Provide adequate ventilation when charging batteries. Chargers can
ignite flammable materials and vapors. Do not use near fuels,
grain, dust, solvents, or other flammables.
Do not charge batteries in excessively hot temperatures; wait till
the cool of the evening.
PRE CHARGE INFORMATION
Before connecting the charger to the batteries, make sure the
battery pack is of the same voltage rating of the charger. If you are
unsure, count the number of cells on the battery pack and multiply
by two. This figure should be the same as the DC voltage rating of
the charger. (see ratings label on charger)
Make sure the AC cord, DC output leads, terminals,
connectors, or clamps are all in good working condition. Do not
use the charger if there are any signs of stress or damage, or if
wires are cut or have damaged insulation. Using this charger with
any of these symptoms could result in a fire, property damage, or
personal injury. Have a qualified service person make the
necessary repairs. Repairs should not be made by people who are
not qualified.
Illustration of series and parallel battery connections.
Parallel Series
When batteries are connected in
Parallel the battery amp hour
capacity is additive and the
voltage remains the same.
Example: two 180 amp hour
12 volt batteries would equal
12 volts and 360 amp hour capacity When batteries are connected in
Series the voltage is additive and
the battery amp hour
capacity remains the same.
Example: two 180 amp hour
12 volt batteries would equal
24 volts and 180 amp hour capacity