New Battery for Oral-B Triumph 5000

Also with me the Braun Oral-B Triumph of the built-in battery has 5000 after 3 years suddenly lost half of its capacity. Looking for a new battery I found this here. The retailer delivered reliably despite the small order quantity of only one copy, and the cheap to (beat?) Total price. In a known video portal you can also find instructions on how to replace the battery (keyword "How to change the battery ..."). Although the solder tails of the batteries do not fit properly, here you have a little skill hobbyists apply. But ultimately succeed the exchange, and the toothbrush works like new again.