Ebay extended battery charging question

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Just this past week I got two of these extended batteries off of Ebay. Although I'm still calibrating the one seen on the charger. I really haven't found anything concrete on how long a battery like this is suppose to charge for? I've read things such as charge it in the phone (which the phone will charge it as if it's the stock battery) use the charger that came with it (charger in the photo continually thinks that the battery is at full charge, when it was in the phone until it died.) To battery calibration apps which I'm reading don't do anything, to bloatware. So if anyone can help me out, it would be great. And sorry if I made any mistakes in this, sending this from my phone is kinda hard for me.

Sent from my HTC Glacier using XDA

I have the same extended battery and I can say that I have no idea. I'm using custom roms, and a charge lasts anywhere from a day to 3. I would say charge it in the phone til full, then drain it by using it, and do that a couple of times, it gets better as time goes on.

Sent from my HTC Glacier using XDA

I have the same battery and when I use the phone to charge it it takes 6 - 7 hours and it lasts pretty good but since I've installed the shot of awesomeness by team inferno the original battery is good enough for my day... My max was 1d 14 hrs 10m 20s with 2% left... Big thanks to team inferno!!!