JST PH 2-pin is what you’re asking for. Regularly use them on 20-28 gauge.

There are smaller connectors, but they have fewer mating cycles and are a pain to work with (tho the ones I mentioned aren’t fun, either). Would recommend 2mm pitch to start with.

They’re very common. Can get a set of 100 connectors for $5ish.

Literally search for “JST PH 2-pin”. Buy a decent crimping tool to save some frustration. Worth the money.

Or buy a set of pairs (make/female) with existing wire leads to start you off and see if they’ll work.

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