Battery

Information about the battery pack and BMS

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Surface RT battery pack with exposed BMS circuit
Batteries are dangerous, working on one is difficult and require patience and skills! Do not disassemble, peel or remove one from the device unless you know what you're doing!
Specifications of the battery pack
Specifications
Title
Manufacturer
Samsung
Capacity
31.5Wh
Voltage
7.4V
Model number
P21GK3
BMS (Battery Management System)
A battery pack requires a reliable BMS. Without it you can't control and balance the cells, leading to fire hazards.
Overview
BMS
Cable
Overview
BMS
Cable
IC's marked with 1-3:
​https://www.dexerials.jp/en/products/surface-mounted-type-fuse/sfh0412.html​
???
​https://www.ti.com/product/BQ28400#product-details##params​
High resolution mock-up of BMS board
BMS board part 1
BMS board part 2
BMS board part 3
BMS board part 4
Cable
BMS board part 1
BMS board part 2
BMS board part 3
BMS board part 4
Cable
Macro shots of the various IC's
Chip 1
Chips 2
Chip 3
Chip 4
Chip 1
10 Amperes SFH Series Self Control Protector(SCP)
Chips 2
??? - Guessing both are balance chips
Chip 3
BQ28400 Netbook and Tablet Lithium ion gas gauge and protector
Chip 4
??? - Chip is unmarked, suspecting it's a temp probe logic
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Last updated 1 month ago

Specifications	Title
Manufacturer	Samsung
Capacity	31.5Wh
Voltage	7.4V
Model number	P21GK3