Articles & guides

The only thing separating those things, if you do not use insulator discs, is just microns of cell wrap. Some people will point out that lithium-ion battery cells have insulator discs built in. But if you take apart just about any lithium-ion battery cell, you will see that the built-in white plastic insulator disc does not fully cover the negative, because it is slightly undersized for the cell.

Well, a spot welder is just a massive switch. When I say massive, I mean electrically massive, meaning it can handle thousands of amps for a small period of time. It is a massive fast switch. A switch so electrically massive and so stunningly fast that it makes even the fastest highest-current relays look like child’s playthings.

Is a higher mAh rating always better? Not necessarily. When it comes to high-power LEDs, internal resistance can be the difference between a bright beam and a battery that overheats. We do the math on 1,000 vs. 3,000-lumen lights to show you exactly when to prioritize capacity and when to hunt for low-resistance "power" cells.

This compact 85x62mm boost converter claims 600 watts of power for under $20. Our bench tests reveal it is a great value for stepping up 12V or 24V, provided you add active cooling. However, users should be aware of its weak stock fuse and inability to regulate current down to zero amps.

A shunt mod is a popular "hack" that tricks your motor controller into delivering more amps than its factory limit.2 By lowering the resistance of the internal current shunt with a simple solder modification, you can gain significant torque and speed. However, this trick comes with physical costs: square-law heating ($I^2R$) and reduced safety margins. This guide explains exactly how the controller measures current and how to estimate your new limits without blowing up your MOSFETs.

Reverse charging occurs when a deep-discharged cell within a battery pack is driven into negative voltage by the surrounding healthy cells. This process causes irreversible chemical damage, including the dissolution of the anode’s copper current collector and the formation of dangerous dendrites. This article explores the mechanics of this failure, the heat generation that follows, and why a functioning Battery Management System (BMS) is your only line of defense.

Many articles frame “LFP vs. lithium-ion” incorrectly—LFP is lithium-ion. The real matchup is LFP vs. NMC. Here’s how they compare on energy density, cycle life, safety, cost, cold-weather performance, and charging speed.

Lithium-ion batteries power our devices, bikes, and cars—but when they fail, the results can be serious. Here’s how to minimize risk, spot warning signs, and respond safely in an emergency.

C-rate tells you how hard you can charge or discharge a lithium-ion battery relative to its size—but it hides key factors like resistance and cooling. We explain C-rate basics, real-world limits, and how to avoid overheating your cells.

Most materials have higher resistance when hot, but lithium-ion batteries are different. Their internal resistance actually drops as temperature rises, improving performance — but also posing risks if limits are exceeded.

We push a constant current buck converter to its limits—charging a 7S NMC pack, powering dummy loads, and sustaining over 650 watts. See real data on voltage drop, efficiency, and temperature stability.

We compare nickel and copper as lithium-ion battery series conductors using real-world voltage drop and resistance tests. See how adding copper dramatically lowers resistance and improves performance.