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The Philips Sonicare 9350 electric toothbrushes has rechargeable lithium batteries. If the electric toothbrush doesn't start, battery failure is most likely to blame. If you need to replace the battery, follow this guide.
This guide requires soldering so if you’re not familiar or would like more information, check out this article on the site.
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Remove the toothbrush head.
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Use a screwdriver to pry gently around the bottom of the toothbrush.
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After the bottom of the toothbrush is pried loose, remove it from the base of the brush.
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Use a spudger to open the two clasps inside the toothbrush handle in a downward motion.
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Turn the toothbrush upside down and push down on a hard surface—this will slide the toothbrush's internal body out.
These are generally white tabs that will easily come loose with the pointy end of a spudger, small screwdriver in a pinch.
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Pull out the internals of the toothbrush.
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Open the protective cover of the battery.
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Check the battery model.
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Open the protection cover of the circuit board.
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Find the welding points of the positive and negative electrodes of the battery and use the soldering iron to desolder.
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The battery will fall off after desoldering as shown in the figure.
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Use a spudger to pry the battery out at a 45 degree angle.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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York University, Team S1-G16, O'Regan Summer 2021 crwdns2935289:0York University, Team S1-G16, O'Regan Summer 2021crwdne2935289:0
YORK-O'REGAN-SU21S1G16
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All good advice and it works too. Ignore Philips advice that the battery is not replaceable. It is, with correct knowledge and understanding. Thanks for posting.
Best way to release the base and get to the locating lugs is to wrap the base of toothbrush in a towel and then use plumbers adjustable grips/pliers to sqeeze gently to deform slightly the handle. That will make prying the base out easier and a similar technique should be used to access and release the locating lugs (see explanation section below)
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