What are the dimensions of the pack?

Dimensions(±2mm): 112 * 65 *8.8mm / 4.41 * 2.56 * 0.35inch(L*W*H)

is this compatible with rp2040 devices like the pico?

Not 100% sure. I think you can use the battery and run the Pico on a breadboard, if that is what you were thinking. The RP runs off of 3.3Volts, so it is close enough. If you want to be safe you can use a TP4056. They are cheap enough.

ASIN	B08T6GT7DV
Best Sellers Rank	#103,893 in Electronics ( See Top 100 in Electronics ) #769 in Rechargeable Household Batteries
Manufacturer	MakerFocus
Package Dimensions	13.21 x 8.2 x 2.9 cm; 180 g

MakerFocus 4pcs 3.7V 3000mAh Lithium Polymer Rechargeable Battery 1S LiPo Battery with Protection Board Insulated Rubber Tape and JST 1.25 Plug for ESP32 Development Board, Mesh Node T114

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