The box clearly states non rechargeable, are these actually rechargeable?!?!

I didn’t pay attention to my box but yes they are rechargeable.

is the polarity of the connector reversed?

The polarity of the connector battery side is as you see it. Red(+) Black(-).... However... I have seen instances were the polarity of the pins on the equipment side has been reversed. A pain. You will have to verify the circuit diagram that you are connecting the battery to.

Can it be used on 3 wire equipment? how to connect if yes? i am trying to use it on logitech mx master mouse.

3 wire Lipo's have balancing tech/ability. These two wire batteries are not setup for that.

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3.7V Lipo Battery 1100mAh 603449 Rechargeable JST 2.0mm,1-Pack

Product ID: 282474582

Details

Battery Capacity
1100
Battery Cell Composition
Lithium
Brand
EEMB
Number of Batteries
1 Lithium

⚡3.7V stable voltage

🔋1100mAh high capacity

🔌JST 2.0mm precision connector

€ 26.24

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power up your smart life with confidence and style!

BUILT TO LAST - Over 800 recharge cycles with advanced protection against overcharge and short circuits.
COMPACT LIGHTWEIGHT - Slim 34.5 x 51 x 6.3mm design weighing just 22g fits perfectly in portable tech.
SEAMLESS COMPATIBILITY - JST 2.0mm connector with exact pin spacing for hassle-free integration.
POWER YOUR DEVICES LONGER - 1100mAh capacity ensures extended runtime for your smart gadgets.
CERTIFIED SAFETY ASSURANCE - UL, IEC 62133-2, and UN38.3 certifications guarantee safe, reliable use and shipping.

The EEMB 3.7V 1100mAh LiPo battery delivers reliable, long-lasting power with a compact form factor and precise JST 2.0mm connector. Engineered for over 800 recharge cycles and equipped with multiple safety protections, it’s UL and IEC certified for safe use in Bluetooth speakers, smart home devices, GPS, and more—perfect for professionals who demand dependable energy on the go.

Specifications

ASIN	B08FD39Y5R
Amperage	22 A
Antenna Location	Alarm, Arduino Board, Bluetooth speaker, Camera, GPS, LED Light, Radio, Remote controller, Wireless headphones, Wireless keyboard, micro controller
Battery Capacity	1100 milliamp_hours
Battery Cell Type	Lithium Polymer
Battery Weight	22 g
Best Sellers Rank	#63,396 in Health & Household ( See Top 100 in Health & Household ) #11 in 3.7V Batteries
Brand	EEMB
Customer Reviews	4.4 4.4 out of 5 stars (1,306)
Item Dimensions	1.36 x 2.01 x 0.25 inches
Item Weight	0.03 kg
Manufacturer	Hubei Zhongju (EEMB) Energy Power Co., Ltd
Model Name	LP603449 with JST PHR 2.0mm Connector
Model Number	LP603449-PCM
Number of Batteries	1 Lithium Polymer batteries required.
Reusability	Rechargeable
Unit Count	1 Count
Voltage	3.7 volts

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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€ 26.24

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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