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.

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

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

Product ID: 244034199

Details

Battery capacity
1100 Hour
Battery cell composition
Lithium
Brand
EEMB
Number of batteries
1 Lithium

⚡3.7V stable voltage

🔋1100mAh high capacity

🛡️PCM protection for safety

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Description

🔋 Power your lifestyle with precision and safety — never miss a beat!

SAFETY FIRST - Built-in PCM protection guards against overcharge, over-discharge, and short circuits for worry-free use.
PRECISION FIT - Compact 34.5x51x6.3mm size with JST connector ensures seamless integration—no guesswork, just perfect compatibility.
POWER THAT LASTS - 1100mAh capacity fuels your devices longer, keeping you connected and productive.
CERTIFIED RELIABILITY - UN 38.3 and UL certified—trusted quality that meets rigorous safety and performance standards.
VERSATILE COMPATIBILITY - Ideal for Bluetooth speakers, dash cams, smart home devices, and more—power your tech essentials effortlessly.

The EEMB Lithium Polymer Battery LP603449-PCM delivers a reliable 3.7V and 1100mAh capacity in a compact 34.5x51x6.3mm form factor. Featuring PCM protection for enhanced safety and certified by UN 38.3 and UL standards, this rechargeable battery is designed for seamless compatibility with a wide range of devices including Bluetooth speakers, dash cams, and smart home systems. Lightweight at just 22 grams, it offers long cycle life and stable performance, making it a trusted power solution for professionals who demand both efficiency and safety.

Specifications

ASIN	B08FD39Y5R
Amperage	22 Amps
Antenna Location	Acaia scale, Arduino Board, Bluetooth speaker, Corsair HS70, ESP32, Garmin Nuvi 880 GPS, Parrot car speakerphone, Radar alarm, Radio, Wimius system, Wireless mechanical keyboard
Battery Capacity	1100 Milliampere Hour (mAh)
Battery Cell Type	Lithium Polymer
Battery Weight	22 Grams
Best Sellers Rank	3,028 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 105 in Rechargeable Household Batteries
Brand Name	EEMB
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (1,383)
Item Dimensions	34 x 51 x 6 millimetres
Item Weight	0.03 Kilograms
Manufacturer	EEMB Co.,Ltd
Model Name	LP603449
Model Number	LP603449-PCM
Number of Batteries	1 Lithium Polymer batteries required.
Reusability	Rechargeable
Unit Count	1.0 count
Voltage	3.7 Volts

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