As exchange defective GP Alcaoell batteries

I have (not from Amazon) buy a car alarm Easy-Fit EF2A.
After I had this taken from the welded repackaging and handle, the machine was not working.
Short call to the seller, immediately a new device has been sent.
As agreed, the instrument was previously extracted from the seller and checked for function.

For me, the equipment 2 days thereafter worked only sometimes. I found that the battery in the remote control (GP Alkaoll-Made in China) was flawed.
A voltage measurement yielded fluctuating !! 7 to 9 Volt.
Then, unfortunately, the battery fell to the concrete floor.
A subsequent measurement showed 12 volts. After installing the remote control worked again only 1 day.

Now I have taken this battery apart:
The single button cells out many.
Rust stains were on the contact springs on the cells themselves verdigris and at the upper and lower plate folds right Verrostungen.
Probably the wrong batteries (wet) were stored.

MN21 have bought (also Made in China) at Amazon 2x Duracell.
Since then, the remote control is working properly.

From my short experience out and due to the good price-performance ratio, I can recommend these batteries.