How to run phone with power supply?
Which terminal is + and which is - where the battery plugs in?
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I'd suggest going with a pre-made adapter, myself. They're cheap and easy to get; here's one that would work fine for about $4 USD.
iPhone battery wire adapter cable for DC power supply
But to answer your question, here's a diagram of the battery connector on the motherboard from repair.wiki.
Pins 1 and 5 are positive and all the green ones, pins 4 and 6 in particular, are negative (ground). Pins 2 and 3 are for the phone to communicate with the battery. Note that you will most likely run into a 3 minute boot loop without the BMS being connected.
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