Battery

Information about the battery pack and BMS

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

IC's marked with 1-3:

1. https://www.dexerials.jp/en/products/surface-mounted-type-fuse/sfh0412.html

2. ???

3. 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

Macro shots of the various IC's

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