For charger: Unfortunately seemingly no reverse voltage protection. Therefore: Watching as is used around the battery !!
I bought the bundle Ladererät / battery and an extra battery as early as last May and has been very satisfied.
When I wanted to make the two batteries again really crowded for my vacation, it smelled at the 2nd battery suddenly very "electric".
I had the battery upside down by mistake in the charger, which then with a lot of smell gave up the ghost.
So immediately on Amazon (Marketplace) a new charger (there is unfortunately only as a bundle) ordered,
and one and a half days later received.
The holiday was rescued, and I now hold 3 batteries.
Despite the problem with the charger, I can definitely recommend the product.