Panasonic KX-TGM420 Operating Instructions Manual page 34

*2 When the base unit is running on battery power
and the remaining battery power is too low, "
flashes and the base unit beeps. Additionally, the
base unit's message indicator flashes.
Panasonic Ni-MH battery performance when
operating on backup battery power
Operation
In continuous use
Not in use (standby)
Note:
• Battery performance depends on the type of
batteries.
• Actual battery performance depends on usage and
ambient environment.
• If the base unit is running on battery power, the
brightness of the message counter on the base unit
is reduced to save battery power.
• When the base unit is running on battery power, the
maximum ringer volume of the base unit will be
reduced.
34 | P a g e
Operating time
3 hours max.
4 hours max.
"