If Your Machine Shipped Without An Onboard Battery Charger, Do The Following; Wet Cell Battery Maintenance; Battery Testing - Nilfisk-Advance Adphibian AX 651 Multi EDS Service Manual

If your machine shipped without an onboard battery charger, do the following:

1. Disconnect the batteries from the machine and push the connector from the charger into the Battery Pack
Connector (17).
2. Follow the instructions on the battery charger.
Service Note: Make sure you plug the battery charger into the connector with the handle attached to it.
Important:
Make sure you have an appropriate charger for use on Gel cell batteries. Use only "voltage-regulated" or "voltage-
limited" chargers. Standard constant current or taper current chargers must not be used. A temperature-sensing
charger is recommended, as manual adjustments are never accurate and will damage any VRLA battery.

Wet Cell Battery Maintenance

Correct maintenance of electric vehicle batteries can greatly extend their life. Well-maintained batteries may last up to
three years, but failure after one year is common if maintenance has been poor.
There are three simple rules for good battery maintenance:
• Maintain Correct Electrolyte Level (Weekly) - Use distilled water in batteries whenever possible. If batteries are
discharged, add just enough water to cover the plates in each cell. If batteries are fully-charged, fill each cell to the
bottom of the filler tube. Do not overfill the batteries! Do not add acid to batteries!
• Keep the Batteries Charged (Weekly) - Batteries should be charged each time that a machine is used for more
than one hour. Machine operators should open the battery compartment cover for charging to avoid a concentrated
buildup of hydrogen gas. Operators should follow the instructions provided with their specific battery charger to
determine how long the batteries should be charged. Even when a machine is stored, the batteries should be
charged once a month to prevent the batteries from "sulfating". Almost all battery caps are vented, so there's no
need to loosen or remove them for charging.
• Keep the Batteries Clean (Monthly) - Use a damp cloth to wipe dirt from the top of the batteries. Battery terminals
must be clean and tight. If the tops of the batteries are wet after charging, the batteries have probably been
overfilled or overcharged.
Note: If there is acid on the batteries, wash the tops of the batteries with a solution of baking soda and water
(2) tablespoons of baking soda to 1 quart of water.

Battery Testing

A battery problem is usually recognized by the machine operator as a decrease in the machine's running time. This
condition is usually caused by one or more "dead cells" in the battery system - that is, one or more cells that are putting
out less voltage than the other cells.
Note: Always charge batteries before testing.
There are two ways to find a dead cell:
1. Use a hydrometer to check the specific gravity (or "state of charge") of the fluid in each cell. A dead cell is one that
reads 50 points (or more) lower than the other cells. The chart below shows the approximate "percent of charge" of
an electric vehicle battery at various electrolyte specific gravity values, corrected to 80°F (26.7°C).
Form No. 56043116 - Adphibian™/AX 651 Multi EDS/AquaPLUS™ - 75