Quick Charge QPXU - Manual (Page 5)

With wet cell batteries, maintain the proper electrolyte level by
adding water when necessary. Never allow the electrolyte level to
fall below the top of the battery plates. Electrolyte levels fall
during discharge and rise during charging. Therefore, to prevent
the overflow of electrolyte when charging, add water only after
the batteries have been fully charged, or just enough to cover
the plates if discharged. Old batteries require more frequent
additions of water than do new batteries.
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.