JST connector

JST connectors are electrical connectors manufactured to the design standards originally developed by J.S.T. Mfg. Co.. JST manufactures numerous series and pitches of connectors.
JST connectors are used in many types of products, and commonly used by electronics hobbyists and consumer products for rechargeable battery packs, battery balancers, battery eliminator circuits, 3D printers, and radio controlled servos.
The term "JST" is sometimes incorrectly used as a vernacular term meaning any small white electrical connector mounted on PCBs.

Connector series

JST manufactures a large number of series of connectors. The PCB connectors are available in top or side entry, and through-hole or surface-mount.

JST series	Pin-to-pin pitch	Pin rows	Current	Voltage	Wire size	Shroud	Lock	Notes	Datasheet
		1	10	250	22 to 16			Unshrouded seems to be more popular than shrouded.
		1	2	250	30 to 24			Similar to female "DuPont" connectors and male pin headers. RF series is double row.
		1	3	250	32 to 22			Not 0.1-inch pitch.
		1	3	250	30 to 20			Not 0.1-inch pitch.
		1	3	250	30 to 22			Not 0.1-inch pitch. Used by many radio control batteries.
		1	3	250	28 to 22			Used by FMA Cellpro R/C battery chargers.
		1	2	100	32 to 24			Many stepper motors. Compatible with KR, KRD, CR series.
		1	1	50	32 to 26			Compatible with ZR and ZM series.
		1	1	50	30 to 26			Not 0.05-inch pitch. Sometimes confused with Molex PicoBlade.
		2	1.25	50	30 to 26			Not 0.05-inch pitch. Double row type connector.
		1	1	50	32 to 28			Compatible with SR and SZ series.
		2	1	50	32 to 28			Double row type connector.
		1	1	50	32 to 28			Lock type connector.
		2	1	50	32 to 28			Double row lock type connector.

JST series	Pin-to-pin pitch	Pin rows	Current	Voltage	Wire size	Features	Notes	Datasheet
		1	3	250	28 to 22	Locking	Used in radio control, also known as BEC or P connector. Commonly found on small models, toys, and small LiPo packs.
		1	3	250	28 to 22	Locking, High force	Commonly used in LED lighting, appliances, and electric bikes and scooters.

Soldering

A majority of JST through-hole headers can't withstand the temperatures required for reflow soldering, because the plastic has a lower melting point since they were designed for wave soldering methods. Some JST surface-mount headers are designed to handle higher temperatures of reflow soldering.

Confusion on the Internet

End-users and 3rd-party sellers on eBay often describe connectors by their wrong name thus perpetuating confusion of the exact series of a specific connector. It is very common in blogs and websites to incorrectly name a specific connector only by the name of the manufacturer.
To minimize confusion, it is best to describe a connector using: the manufacturer's name, exact connector series, and optionally the pitch, such as "JST-XH" or "JST-XH-2.50mm" or "2.50mm JST XH-series" or other variations.
The official J.S.T. Co. website allows users to check certain models for their authenticity and specifications.
Note: Some 2.50 mm parts are incorrectly sold on the Internet as, and the 1.25 mm parts as.