during past month my it appeared that my phone's battery seems to be reaching its final destination. First decided to clear out possibility that it enormous battery drain wouldn't be software issue. After clearing that out, it was time to seek new battery replacement, preferably genuine product.
After reading some comments and recommendations, decided to order new battery from eBay. Shipment arrived approximately week and half from order date. Package included only battery for non-retail purposes and no installation tools. I was aware lack of tools since already had required ones when got new battery for my wife's iPhone 5. Day after arrival decided to replace phone's current battery with brand new one. Process took roughly 20 minutes and with help of iFixit instructions, entire process was averagely easy to proceed. If I have to point out any possible challenge(s), battery was connected to phone's body with adhesive and to be honest, it required a bit of gentle prying to be able to remove current battery. Also when removing back cover, freeing some of the clips was a bit tacky but luckily was able to free all of those without causing major damage to back cover including fragile clips. Unfortunately one clip was partly damaged but I was able to clue it back together before installing cover back to phone.
Here's some photos I took during battery replacement process, mainly as purpose to describe how process looks instead of giving step by step instructions how to complete the process. Whoever I suggest to follow precisely instructions provided by iFixit.
