Panasonic EB-X700, Service Manual

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The estimated battery capacity is displayed as a LCD battery icon. It is derived from battery voltage and current consumption
measurements made by U100 as shown below:
When a deeply discharged battery is used, a pre-charging circuit is automatically enabled for trickle charging when a charger is
connected. Also the charging (RED) LED is automatically enable even though the unit is not active. Only after the battery has
sufficient charge that it will automatically enter normal charging operation.
Only approved chargers can be used with the handset. By using only approved chargers and the unique Panasonic J300
connector no additional circuitry is provided within the unit to protect from charger voltage exceeding the design limit of 7.0 V.
4.8.5. Battery Charging and Monitoring
The phone supports detection of an USB data cable through the presence of VBUS in the I/O connector.
4.8.6. Accessory Detection
7 4.07 V < VBATT < 4.20 V
6 3.95 V < VBATT < 4.07 V
5 3.85 V < VBATT < 3.95 V
4 3.70 V < VBATT < 3.85 V
3 3.65 V < VBATT < 3.70 V
2 3.60 V < VBATT < 3.65 V
1 3.45 V < VBATT < 3.60 V
Low Voltage Alarm 3.35 V < VBATT < 3.45 V
HW Shutdown VBATT < 2.9 V
±
0.06 V
Icon Status VBATT
Icon Status VBATT
PROVISIONAL ISSUE