Battery Charging
With fully charged batteries, the Model 4540 gauge remains
operational for approximately one week under normal (8-hour
day) conditions.
If the batteries become discharged, the following message
displays on the gauge:
When this display appears, there are a few hours remaining
before the battery must be recharged. In an emergency, a 30-
minute recharge with the DC or AC charger gives several hours
of use. If possible, run the batteries down before recharging.
To charge the NiMH batteries:
1. Plug the AC charger or DC adapter into the charger
connector in the gauge’s control panel (see Figure 3. Model
4540 Control Panel on page 3–3).
2. If using the AC charger, plug the other end of the charger
into a standard 100–240 V AC outlet. If using the DC
adapter, connect the other end to any 12-14 V DC source
(such as a vehicle's power receptacle). The charging icon (
)shows at the top-right of the screen.
3. After recharging the batteries, unplug the AC charger or DC
adapter and store for later use.
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