Njoy Ranger 60KR User Manual page 46

Before carrying out any kind of service and/or maintenance,
disconnect the batteries and verify that no current is present and no
hazardous voltage exists in the terminals of high capability capacitor such
as BUS-capacitors.
Only persons are adequately familiar with batteries and with the
required precautionary measures may replace batteries and supervise
operations. Unauthorized persons must be kept well away from the
batteries.
Verify that no voltage between the battery terminals and the ground
is present before maintenance or repair. In this product, the battery circuit
is not isolated from the input voltage. Hazardous voltages may occur
between the battery terminals and the grounding/earthing.
Batteries may cause electric shock and have a high short-circuit
current. Please remove all wristwatches, rings and other conductive
objects before maintenance or repair, and only use tools with insulated
grips and handles for maintaining or repairing.
When replace the batteries, install the same number and same type
of batteries.
Do not attempt to dispose of batteries by burning them. This could
cause battery explosion. The batteries must be deposed according to local
environmental regulations.
Do not open or destroy batteries. Escaping electrolyte can cause
injury to the skin and eyes. It may be toxic.
Please replace the fuse only with the same type and amperage in
order to avoid fire hazards.
Do not disassemble the UPS system.
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