No need to apologize.
I missed the 1.25 mm in the battery’s description.
The CubeCell HTCC-AB01 indeed uses a 2-pin connector with 1.25 mm spacing for the battery.
But Heltec’s product information is incorrect in calling this a ‘SH’ connector!
JST Connectors
‘XH’, ‘PH’, ‘ZH’, ‘GH’ and ‘SH’ connector designations come from JST connectors.
JST type connectors are manufactured to the design standards originally developed by J.S.T. Mfg. Co. (Japan Solderless Terminal).
The following are popular JST (type) connectors. Each has a different pin spacing:
| JST connector type | Pin spacing |
|---|---|
| JST-XH | 2.5 mm |
| JST-PH | 2.0 mm |
| JST-ZH | 1.5 mm |
| JST-GH | 1.25 mm |
| JST-SH | 1.0 mm |
JST-SH has a pin spacing of 1.0 mm, therefore the connector with 1.25 mm spacing on the HTCC-AB01 board is not ‘SH’ type.
So is it JST-GH then, which has the same 1.25 mm pin spacing?
Actually not. Original JST-GH from JST has a lock (clearly visible) while ‘JST 1.25 mm’, JST-XH, JST-PH, JST-ZH and JST-SH have not.
The battery connector on the HTCC-AB01 (which is also used on some other boards) looks more like a Molex Picoblade 1.25 mm connector.
On Chinese sites like AliExpress you will often see this connector being referred as ‘JST 1.25 mm’ (without type name) or sometimes (probably incorrect) as (JST) GH 1.25 mm.
Sometimes they are even incorrectly listed as PH 1.25 mm (or in case of Heltec’s product information SH 1.25 mm).
If on sites like AliExpress a connector is described as ‘JST 1.25 mm’ or ‘GH 1.25mm’ then it will probably fit HTCC-AB01’s battery connector.
Don’t forget to check for correct polarity. If polarity is reversed you will first have to correct it by switching the cable cores in the connector. Cable cores can be removed by unlatching them with a needle (with some care and patience).