I give only 3 stars because this battery of performance-wise was as strong or weak as my built in 2012 replacement battery.
I thought / the'm my battery has become a little weak, I have ordered this battery (2x have two Iphone 3GS), but these were not significantly better than those who were installed in my old second and third smartphone.
Therefore, I have sent them back.
Have 4 (business phone) I've recently installed new battery used, for comparing an Iphone.
Have all 3 smartphone fully charged and not touched to see how fast they are discharged. completely free of messages etc. Airplane mode.
Result after 4 days,
Iphone 4 - has 94%
Iphone 3 GS - a 27% a 33%
Property then in the one Iphone 3 GS installed my old battery and tested again.
After 3 days:
Iphone 3 with the purchased here Battery - 46%
Iphone 3 with my old battery - 35%
The last thing I have installed the SIM card and have the smart phones put into operation to see how long they keep in operation.
Approximately 10 short calls, 30 - 40 e-mails, sent about 30 messages per Whatsapp, Facebook was also logged.
Email addresses etc. I entered the same on both devices, so have both get the same emails and messages.
After about 9 hours the phone announced with the old battery 10% Akuu capacity, and after about 10 hours, the new with the battery.
This performance was simply too weak, the battery did not have to be as powerful as the the iPhone 4, but a little more capacity than the old would you have been.
I am not a disgruntled customer, since the seller has unhesitatingly taken the battery back, but I would recommend keeping the battery only people whose smartphone not half a day, so they are already barely usable without a charger nearby.
For people whose battery is now not defective and already hold a day through, which I would not recommend the batteries.
