Project:Laptop Powerbank

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Surface Pro 4 Powerbank

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Status: in prototyping
Release Date: Jan 2019
Initiator: Luzian
Materials Used: 18650 litium battery, BMS
Tools Used: soldering iron
Approx. Cost: ~35$


My dad's daily driver is a Microsoft Surface Pro 4 and the NON-removeable battery has lost some of its capacity over the years, otherwise it still works fine. So we want to build an external battery pack.

The Surface's power supply delivers 12 V DC, about the voltage you get out of a 3s Li-Po or Li-Io. I ordered a power plug for the Surface (it's a special magnetic connector with support for a dock) and we connected it to a 3s 3000mAh Li-Po. The laptop drained the battery all the way down to 10 V, for us this means we won't need a boost converter.

Now I have to order 6 18650 cells and a suitable BMS.