Panasonic G600 Technical Manual page 40

POWER SUPPLIES
9.5.2 Battery Charging circuit
The CPU within the phone controls the battery charging. When external power is present the phone is automatically
switched on. If rechargeable cells are detected and the temperature is within specified limits the charger starts
using a rapid charge algorithm.
With Ni-MH cells, charging is determined by delta V, with time, temperature and voltage safeguards. With Li-ION,
cells, charging is determined by constant current, with time, temperature and voltage safeguards.
Deeply Discharged batteries
When a battery is deeply discharged, there may not be enough power to power on the phone for charging. In this
case the charging circuit must automatically detect if the batteries are rechargeable and start slow trickle charge
until there is enough power to switch on the phone.
9.5.3 Power Fail
The SIM card contains EEPROM; if power fails while the SIM is active, the SIM may corrupt its memory as the
supply voltage drops out of specification.
The nLVA_INT is a non-maskable interrupt to the CPU, which forces exception processing whenever the battery
voltage drops below 3.2V.
MCUK980101G8 Section 9 Issue 1
Technical Guide 9 - 7 Revision 0
http://cxema.ru