Panasonic KX-TG5771BXS Service Manual page 15

KX-TG5771BXS/KX-TGA570BXS
4.5.3.1. Charge Circuit
The voltage from the AC adaptor is supplied to the charge circuits. Main charge (130 ~ 220 mA at the Battery) of maximum
7-hours is started soon after the Handset is placed on the Base Unit. Then it changes to Trickle charge to prevent from
overcharging.
Q361 and Q362 detect the ON-HOOK state (Handset is placed on Base Unit).
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