How to Revive Dead Philips - Norelco RQ1280 SensoTouch 3D Shaver

ID: 151879

Description: If the shaver is left dead and uncharged for...

Steps:

1. Disconnect the motor, and remove the motherboard and battery assembly from the housing.

2. Provide 3.7-4.2 V to the battery using a voltage-controlled power supply or buck converter. (A charging circuit might work, but since the battery voltage is so low, it might be undetectable)
3. Depending on how depleted the battery is, the period of 'charge' will vary. Monitoring the rate of voltage discharge provides an indication of the "holding capacity" of the battery.
4. Quickly assemble the shaver when the battery holds a voltage for a few minutes.
5. Lithium-ion batteries are sensitive components, always monitor the voltage whilst charging without a proper charging circuit.

6. Briefly testing the system by pressing the power button shows signs of life.

7. Assemble the device in preparation for charging.

8. Place the shaver on the charging dock or cleaning station to begin the charging process.

9. Once charged, the shaver worked as expected.
10. Naturally after many years of use, the battery shows sign of reduced capacity.