Section 2: Description of Charging System
10
Charger Display Messages
The LCD displays the following messages, depending on operation status:
* See Battery Conditioning and Voltage Droop in Section 5: Battery Characteristics and Handling.
User Action
Charger
Active
Lamp?
LCD Display Text Description
Power turned on or
battery pack
connected to charger
Off
DETECT
BATTERY
Message displays for a few seconds when power is turned on or
when battery pack is connected to charger.
- Off
NO BATTERY
Battery is not connected to charger.
- Off
SELF TEST
DISCONNECT BATTERY
Charger performs a short self test when power is turned on, which
requires that you disconnect battery pack.
- Off
READY NIMH14.4
15.5V 25C
Valid battery pack is connected to charger, and is ready to be
discharged or charged. NIMH14.4 should match label on top of
battery pack (NIMH14.4, NIMH10.8, or NIMH7.2). If not,
disconnect and then reconnect battery pack; if it still does not
match, there may be problem with battery pack, cable, or charger.
On
DISCHARGE H:MM:SS
12.2V 25C 6.0A 350KJ
This is typical message during discharge cycle. Press
Discharge
button
Off
EMPTY H:MM:SS
12.2V 25C 1.0A 440KJ
Battery discharge cycle is complete, and battery pack is
successfully discharged.
On
WARM-UP CHARGE MM:SS
15.5V -1C 0.1A 3KJ
You may see this after pressing Charge button, if battery pack is
cold (< 3 °C). Charger charges at low current until battery pack is
warm enough to fast-charge; message then typically changes to
FAST CHARGE.
On
REFILL CHARGE MM:SS
8.4V 25C 0.1A 5KJ
You may see this after pressing Charge button, if battery pack
voltage is very low (< 0.8V/cell). Charger charges at low current
until voltage raises enough to fast-charge; message then typically
changes to FAST CHARGE.
On
FAST CHARGE H:MM:SS
15.5V 25C 5.0A 350KJ
This is typical message during charge cycle, indicating high-
current, fast-charging of battery pack.
On
TOP OFF H:MM:SS
15.5V 41C 1.5A 450KJ
You may see this towards end of charging cycle, indicating
reduction of charge rate, when battery is nearly full or if
temperature > 40 °C.
Off
BATTERY FULL H:MM:SS
15.5V 38C 1.5A 550KJ
Battery charge cycle is complete, and battery pack is
successfully charged.
Press
Charge
button
Off
CHARGE FAILED H:MM:SS
12.2V 25C 6.0A 500KJ
Error message results from one of following:
• Temperature > 50 °C – Note energy added to battery pack. Place
battery pack and charger in a cooler environment. Then charge
again; add energy from both charge cycles together to get total
energy added to battery pack.
• Charger timer expired – Battery pack may be hot, old, or
damaged. See above to check if temperature is problem.
Otherwise, battery pack may need to be conditioned *
or replaced.
• Voltage/cell > 1.8 V – Battery pack may need to be
conditioned * or replaced.
- Off
INVALID BATTERY
13.3V 35C
Error message results from one of following:
• Battery pack is wet, dirty, or damaged. Clean / dry battery pack
and try again.
• There may be problem with battery pack or cable.
• Incorrect battery pack type is connected, and is not supported by
charger firmware.
- Off
THERMISTOR ERROR
Battery thermistor indicates unreasonable temperature, outside
range of -10 to +65 °C. Battery pack, charger, or charger cable may
need to be replaced.
- Off
INTERNAL ERROR
Error message; possible causes include:
• CPU errors.
• Timer resets.
• Software errors.
Turn power off and then on, and check again. If error message
persists, charger may need to be replaced.
Note:
Values for voltage, current, etc. in the
table are typical values you might see
for a 12-cell battery pack.
134
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