will this fit a sena 20s, & is it just a case of swapping the connectors on the battery to match the polarity on the system board (no soldiering need

Not sure, but Google shows that Sena 20s is using 2540 battery (25x40x7.5 mm) . This one may be too big. You need to measure the space first.

What is the connector? i bought this and the jst connector does not fit the jst connectors i have, so what is that connector ???

It is JST PH (2mm pitch). There is 12 types of JST connectors listed on Wiki.

Can i cut the connection off so i can solder it to a circuit? if so which do i cut first?

Cut one connection at a time, do NOT cut through both at the same time… if you short them together they may weld together and then proceed to burn. If you do cause a fire don’t use water, use sand, dry soil to smother the battery.

Package Dimensions L x W x H	23.4 x 17.8 x 0.9 centimetres
Package Weight	0.06 Kilograms
Product Dimensions L x W x H	34 x 51 x 6 millimetres
Item Weight	0.03 Kilograms
Brand	EEMB
Part number	LP603449
Size	1
Guaranteed software updates until	unknown

EEMB Lithium Polymer battery 3.7V 1100mAh 603449 Lipo Rechargeable Battery Pack with wire JST Connector-confirm device & connector polarity before purchase

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