What you need
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Use your PH1 screwdriver to remove the 4 visible screws holding down both end caps (2 screws per cap).
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Put the selector on "3 mm" and pull it off the clipper (this requires some force)
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If you look at the second picture, you can see that under the guide that actually selects the trimming length, there is a vertical indent going straight down and atop it a bump between it and the length guide.
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The reason the ring is hard to pull out is because of this little bump.
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The vertical indent will also help to reassemble the clippers when you're done.
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Use your PH1 screwdriver to remove the screw holding the main body parts together as well as the 2 screws on top holding the motor in place.
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Pry the body apart starting from the bottom, you can use pry tools or a flat head screwdriver to get some leverage (though the flat head will likely damage your clipper a bit).
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This will expose the insides of the clipper. The battery is attached under the PCB.
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To remove the PCB, pull the tabs holding it in place near the bottom and it will slide out. The motor was unscrewed in step 4 and will slide out as well.
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The battery is a standard 3.6V Lithium-Ion battery, you can find them for cheap online.
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The DC motor is a FF 128PD and the clipper end can be removed. This motor is impossible to find online but you can buy an FF360 instead, it's slightly shorter but the screw spacing is the same and fits this razor.
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Luckily, these clippers use a very commonly available 3.6V Lithium-Ion battery. you can find these everywhere on sites like aliexpress. It does not matter whether the part matches eXaCtLY as long as the voltage is the same. And if the capacity of the new one is higher, that's a win for you!
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The battery is held down with tape and 2 metal plates soldered to the PCB and the battery.
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Remove the metal plates as best as you can, it doesn't matter too much if you cut them off or damage them as it's easy to make new ones.
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Remove the old battery.
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Place the new battery, if you kept the original metal tabs intact, then make sure they make contact and secure them with electrical tape.
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If you damaged the old tabs, I cut part of an old candle to make a new metal tab on the positive side of the battery and stuck it in place with tape (electrical tape is better).
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To reassemble your device, follow these instructions in reverse order.