A higher capacity battery should work even better because a fully charged 900 mAh battery allows the phone to operate 50% longer than a 600 mAh battery between charges. I have had good results with Rayovac Recharge Plus 900 mAh in my Philips SE450. This phone will latch and not operate upon ringing if it doesn't like its batteries (probably high internal resistance), even though the batteries test good on a battery tester.
SOURCE: new batteries for Philips Dect 225 phones
1.6V to 1.7V doesn't bother . Normally handset have voltage booster, DC to DC circuit to 3.3V for microprocessor. Even 2*1.7V =3.4V , still ok for microprocessor .
SOURCE: Philips CD125 Twin Cordless Phone "Searching" problem
Maybe, RF amplifier chip die or antenna broken.
SOURCE: my phones (philips cd445) will not hold a charge
You might have what is called "memory'. If you continue to replace the phone on it's charger after each call the battery will "think" it's empty, giving you s short charge time. Next time you replace the batteries (rechargeable) FULLY charge them then leave the phone off the charger until you go to bed at night.
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