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So Im going to have an used HTC Desire 530 soon for ROM testing but so far I do not see any battery replacement guide. I know the phone has unibody design but it is still able to disassemble the phone, so can I just buy a new battery and plug it in or I’ll need to do some soldering?

will you be able to dissemble a unibody designed phone? with the right tools, yes. I used a sturdy thin plastic material similar to a credit card but much thinner to open a sony Z1 and a sony Z Tablet in the past. I havent seen a phone that requires soldering with battery connection in years, You wont need soldering then. it’s likely to have a tiny plug-in-like connector that you can unplug then to replace the battery. Remember to look for the exact battery for the exact model so you wont have issues.

You need to wach this video on how to do it — https://www.youtube.com/watch?v=W3Eav-JX