Doosan DX60R Shop Manual page 256

Inspection of Battery Electrolyte Level
This machine has two maintenance free battery. It never
requires the addition to water.
When the charge indicator becomes transparent, it means low
electrolyte state because of the leakage or charging system
error. Determine the cause of problem and replace the battery
immediately.
Check Charging State
Check charging state through the charging indicator.
• GREEN: Sufficiently charged.
• BLACK: Insufficient charged.
• TRANSPARENT: Replace battery.
Check the Battery Terminals
Be certain that battery is held securely in its compartment.
Clean the battery terminals and the battery cable connectors. A
solution of baking soda and water will neutralize acid on the
battery surface, terminals, and cable connectors. Petroleum
jelly or grease can be applied to the connectors to help prevent
corrosion.
Battery Replacement
When the charging indicator indicates transparency state,
replace the battery.
Engine
Page 76
Figure 87
Figure 88
FG010161
FG010162
SP001693