How long does the battery last?

One thing first:
-I Got me never done sword, to evaluate the product. On the one hand I am eternally grateful for this innovative cooling technology. I've been suffering for years from severe razor burn. And the cooling really helps! So far I go after shave good 3 (!) Minutes by face under the cold water tap. Regardless of the cost of water, which is quite time consuming, uncomfortable and embarrassed in front of others.
-The Shave works without problems well. The shaver seems a bit clunky and difficult to use, but is pure matter of habit.

Negative, and therefore downgrade
No shave without charging or no power plug. (What is this?) Wobbly charging station.

Also a star deduction:
A maximum of 10 to 12 minutes shaving with cooling. On the one hand me a constant pleasant cooling is more important, and so I like to take a permanent charge in purchasing. For the razor's finally there. But then how long does the battery last?
Then I could not answer even the customer service. I got it now, since January this year. So far there were no problems. The Kassenbong I would keep well. If the battery is within the warranty period up his mind, I'll get back, and will change the review. If there are opinions on the shelf, please write me this.