Doosan DX700LC Operation And Maintenance Manual page 264

Inspection of Battery Electrolyte Level
This machine has two maintenance free batteries. They never
require the addition to water.
When the charge indicator becomes transparency, it means low
electrolyte state because of the leakage or charging system
error. Determine the cause of problem and replace the batteries
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 the 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. The batteries should always be replaced in pairs.
Using an old battery with a new one will shorten the life span of
the new battery.
Inspection, Maintenance and Adjustment
4-76
Figure 144
Figure 145
FG000347
HAOU790L
OP001123