The world of JST connectors, JST stands for Japan Solderless Terminal, that’s pretty much more than what you really need to know in my opinion other than the technicals. If you’re like me and only interested because you find yourself needing to replace a broken connector, well what I’ve rapidly figured out is you need to make sure you’re getting the correct size (duh), there’s obviously the basic questions you would know, such as how many pins, but they come in different sizes. 1mm, 1.25mm, 1.5mm, etc.
Your best bet is to actually measure your connector and look for an exact match. This page was a good starter on how to distinguish what you’re looking for.
Common JST Connector Types – Matt’s Tech Pages
Then you either go to genuine sellers or you simply find what you’re looking for on eBay. You could go to Aliexpress, if you’re ok with waiting a very long time.
Links & References
Mini Micro JS 3 Pin Connector plug cable male and female new x 20 | eBay
Mini Micro 3 pin for sale | eBay
ZH 1.5mm Mini Micro JST Male for sale | eBay
ZH 1.5mm 3-pin for sale | eBay
JST ZH 1.5mm 3 pin for sale | eBay
10PCS Mini Micro ZH 1.5mm 3 pin Jacks JST Connector with Wire YXSA | eBay
2pcs JST ZH 1.5 3 Pin Male Female Connector Wires Cables 15cm Mini Micro FAST | eBay
5 Set 2/3/4/5/6/7/8/9/10Pin ZH1.5mm Mini Micro JST Male 15cm Cable + Female XY | eBay
JST ZH 1.5 3 Pin Male Female Connector Wires Cables X 5 15cm Mini Micro | eBay
JST ZH 1.5mm 2-Pin 3-Pin 4-Pin Connector PCB Socket Wire Cable UK Seller | eBay
15134-0402 Molex | Mouser United Kingdom
Mini Micro JST 1.0 PH 3 Pin – Google Search