Edit: see comments for clarifications.
I am probably late on this one, but god damn this is one nasty trick by Philips.
Context; I recently decided to upgrade my shaver, from a Philips One Blade to Philips an all-in-one-trimmer-7000. As you can see on the pictures below, they changed the charger for the adapter by maybe 1–2 millimetres, just so the old charger could not be used by the old charger. Now, this normally isn’t a big deal, but with the new trimmer, the charger is USB-A only. Where’s the previous one had the plug on it instead. To me this is mildly infuriating as I know need to get an extra adapter just to charge my shaver in the bathroom. They had the exact same design for the chargers, yet changed it just slightly so they wouldn’t be able to be reused? Why… Philips… why?
Edit: many good points in the comments! I don’t know how to manually check the voltage, but seems like folks figured it out in the comments too. Should have just been USB-C!
Isn’t it to make sure that you’re not mixing two incompatible chargers? I have 2 Philips chargers that do fit (as far as I can see), but are not the same voltage. I’ve previously also had something like this where 2 fitting chargers were completely different electrically, one 12V AC and the other 9V DC. One time a family member mixed them up, bit luckily the extra voltage didn’t fry anything. I don’t mind having to get an extra charger of it prevents me from doing something dumb and frying my electronics.