Denso BHT-4000 User Manual page 150

Charging Operation and LED Indication
Operator's Action
Power on the CU-4000.
⇓
Place the BHT-4000 on
the CU-4000.
⇓
(Approx. 8 hours)
⇓
Remove the BHT-4000.
* "Trickle charging" is a slow continuous charge for a battery, which compensates
for the amount of discharge slightly happening even if batteries are not in use.
CU-4000 Status
On standby
⇓
Ordinary charging
⇓
Trickle charging*
⇓
On standby
140
LED Indication
POWER DATA CHG I
ON
POWER DATA CHG I
ON ON
POWER DATA CHG I
ON Flashing
POWER DATA CHG I
OFF
ON
CHG II
CHG II
CHG II
CHG II