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Can i use a battery with APN 616-00036 instead of 616-00033 that is the one allready installed in the phone??? Are they compatible?

Battery compatibility issues are no longer an issue with recent iPhones. You can check out this previous Answer (Battery APNs, how much is important?). Order your batteries from a trusted source, like iFixit and you wont have problems.

Yes, Compatible with Part APN#: 616-00033, 616-00036 / Voltage (V): 3.82 / Watt Hours (Wh): 6.55 / Capacity (mAh): 1715mA

YES SIR . You Can Use Battery With Your iPhone 6S APN 616-00036 - 616-00033…… this to same iphone 6s Battery ….. APN NUMBER

Please remember. The older 6s MUST HAVE 00033. The 616-00036 does not fit, even after “moving around”.

I had trouble installing the 36 where a 33 came out. It behaved as though it was the wrong battery Angling and tipping the connector, rolling onto the logic board (instead of installing parallel to the logic board surface) helped and it went right on. :)