Hitachi UC 14YFA Technical Data And Service Manual page 7

4-1-5. Easy-to-read visual display of charging status through constant lighting or flashing of red and green pilot
lamps
Prior to charging
Red pilot lamp
During charging
remains lit or
flashes
Charging
completed
Charging not
possible
Green pilot High battery
lamp is lit
temperature
Battery type
Nickel cadmium (Ni-Cd)
batteries
Nickel metal hydride
(Ni-MH) batteries
Pilot lamp indications
Blinks
Lights
Blinks
Flickers
Lights
Charging of heated (high temperature) batteries
Battery temperature
range during charging
---5 ˚C to 60 ˚C
0 ˚C to 55 ˚C
5
0.5 sec. ON 0.5 sec. OFF
Stays ON constantly
0.5 sec. ON 0.5 sec. OFF
0.1 sec. ON 0.1 sec. OFF
Stays ON constantly
Heated (high temperature) battery
Green pilot lamp lights. When battery temperature is
reduced to 55 ˚C, green pilot lamp goes OFF and
charging begins.
Green pilot lamp lights. When battery temperature is
reduced to 45 ˚C, green pilot lamp goes OFF and
charging begins.
Battery or charger
is faulty.
Charging not possible
because battery
temperature is too high.