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 3.7V 1100mAh 603449 Lipo Battery with JST Plug 2mm, 1PC

Product ID: 244034199

Details

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

⚡22A max discharge current

🔋1100mAh high capacity

🛡️Built-in PCM safety protection

¥2962

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Description

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

SAFETY FIRST ALWAYS - Integrated PCM safeguards against overcharge, short circuit, and over-discharge for peace of mind.
COMPACT LIGHTWEIGHT - Slim 34.5x51x6.3mm design at just 22g fits seamlessly into your tech arsenal.
RAPID RESPONSE CURRENT - 22A max discharge ensures your gadgets get instant power when it counts.
UNIVERSAL COMPATIBILITY - Perfect for Bluetooth speakers, GPS, smart home devices, and more — keep your essentials powered up.
POWER PACKED PERFORMANCE - 1100mAh capacity fuels your devices longer without compromise.

The EEMB 3.7V 1100mAh 603449 LiPo Battery with JST 2mm plug delivers reliable, high-capacity power in a compact form factor. Featuring a robust 22A discharge rate and built-in PCM safety protections, it’s UL certified and designed for a wide range of portable electronics including Bluetooth speakers, GPS units, and IoT devices. Lightweight and rechargeable with over 500 cycles, it’s engineered for longevity and peace of mind.

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	3,790 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 104 in Rechargeable Household Batteries
Brand Name	EEMB
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (1,445)
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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¥2962

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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