Panasonic KX-TG2480BXS Service Manual page 51

KX-TG2480BXS / KX-TGA248BXS
13.3.1. Charge Circuit
The voltage from the AC is supplied to the charge circuits. Normal charge of maximum 6-hours is started soon after the Handset
is placed on the base unit. Then it changes to Trickle charge to prevent from overcharging.
Q381 and Q382 detect the ON-HOOK state (Handset is placed on base unit).
Q350 and Q351 control the charge current.
51