Unlike most DIY electric bicycle batteries that are spot welded together like professionally produced battery packs, DIY powerwall builders needed a way to economically join thousands of cells quickly, cheaply and in a way that would allow them to remove cells that went bad over time. Thus, the DIY powerwall community adopted the sometimes controversial method of soldering battery cells together into their massive battery packs. This soldering process had the benefit of allowing builders to add in cell-level fuses like Tesla includes in their packs, but the jury remains out on exactly how large of an effect the heat of a soldering iron can have on the longevity of Li-ion battery cells.As battery pack building started becoming more accessible, I began committing to paper all of the knowledge and experience in DIY lithium-ion battery pack building I had collected over the years. This effort to create a single source of high quality educational content on DIY batteries eventually turned into the Amazon bestselling book DIY Lithium Batteries.

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Between writing the book and running a YouTube channel that teaches people the art of battery building, I’ve interacted with countless makers and hobbyists that wanted to join the DIY lithium battery craze. One of the most common desires I saw was for a modular battery pack building system. Instead of using welding and soldering to create permanent battery packs, DIYers wanted to be able to swap out lithium batteries the same way you swap out AA’s in your TV remote. Nothing like this existed on a scale and power level appropriate for powering large energy storage installations or electric vehicles. So I got to work with a team of bright, enthusiastic young engineers and designers and we created a solution.Last summer we debuted the first version of our idea, called the Vruzend battery building kit. It incorporated press-fit battery caps that fit on the end of common lithium-ion battery cells, using spring-loaded terminals and threaded terminal posts. The caps lock together, allowing the battery builder to create the exact size, shape, voltage and capacity of battery needed for any project.

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However, this sort of behavior can confuse the laptop’s battery meter. No matter how well you take care of the battery, its capacity will still decrease as a result of unavoidable factors like typical usage, age, and heat. If the battery isn’t allowed to run from 100% down to 0% occasionally, the battery’s power meter won’t know how much juice is actually in the battery. That means your laptop may think it’s at 30% capacity when it’s really at 1%—and then it shuts down unexpectedly.Calibrating the battery won’t give you longer battery life, but it will give you more accurate estimates of how much battery power your device has left.Manufacturers that do recommend calibration often calibrating the battery every two to three months. This helps keep your battery readings accurate.