After I received the battery I have unfortunately the same notice something negative.
The tool is unfortunately only a small cross and a screwdriver, but the rubber suction cup because you can see in almost all video tutorials missing.
After I installed the battery, which fits perfectly, I have only once loaded as described him 3 hours.
When I launched the iPhone after 3h whole 3% battery power were to me and displayed according to the display the battery is not charged, but the iPhone was in mains operation.
Then I tried to look for apps that give me detailed information about the battery condition.
Here, the iPhone crashed several times and started again.
After another manual reset I suddenly had 92% battery, but the crashes did not stop.
Because I use my iPhone as an alarm clock, I just gave up about 23 clock and built the original battery.
Now everything works again, which only allow one conclusion for me.
This battery is used in my iPhone iOS combination !!!
Edit:
Something like this is really exemplary.
I had not himself turned me SINTECH because I wanted to do no annoying Support for few euros (recently had problems with another company).
They have contacted me due to this evaluation and have given me free replacement.
This was delivered very quickly and works perfectly.
So from SINTECH can learn a lot many other companies still.
THANKS