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Panasonic ER-SB40 -k Corded Use Hoax

Posted in hardware by mschlander on 08/09/2018

I’m sorry but I have to share a little rant/consumer announcement.

Merely three years ago almost to the day I bought a Philips QG3371 beard trimmer, and for some time already the battery has been worn out causing the machine to stop during trimming even with the AC adapter connected which is annoying and also rather painful.

So I needed a new beard trimmer, and didn’t want to make the same mistake twice. I failed to find any beard trimmer running solely on AC power, but I did find a couple of models that advertised both corded and cordless operation, which I thought would be a long term durable design and I went with the Panasonic ER-SB40 -k.


However the first thing I noticed browsing the manual was that corded use was a truth with some major modifications.


So they got me with planned obsolescence again. So-called corded use or “AC operation” requires the battery to be functional and at least partially charged. So when the battery is worn out not very long from now the entire device will be rendered useless just like the Philips QG3371. The Panasonic has a Lithium-Ion battery which should last a bit longer than the Ni-MH of the Philips at least.

I don’t know if there might be any good technical reasons for this, but e.g. my laptop runs perfectly fine on the AC adapter with the battery worn out or even with the battery completely removed.


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