After using the series 7 for 14 years, the battery is worn out but the device still works well with the cable.
I ordered the series 9 pro.
What a huge difference from its predecessor.
Much quieter and an even better, especially faster result.
The big advantage of Braun is that they never bite or hurt. The head lasts a long time. I replace the card when I feel it is necessary and not when the device gives the message.
However, I do think the material from my old series 7 is much more solid than the material from the series 9.
I hope this one will last a long time too.
Am happy with it.