No welding required. This battery box is designed to house four standard rechargeable cells, which helps reduce the internal resistance, improves discharge performance, and can extend battery lifespan by avoiding soldered connections. Key features Power display: builtin 3 LED indicators show the battery status at a glance. Fourcell capacity: compatible with four 18650 or four 26650 rechargeable batteries. Easy to use: no soldering or welding needed; simply insert four cells and use. Practical design: compact and simple to install, intended to simplify battery assembly and replacement. Compatibility and suitability Compatible with four 18650 Liion cells. Compatible with four 26650 Liion cells. Ideal for DIY projects that require a fourcell Liion pack, or as a replacement battery box for devices that use four cells. Use scenarios DIY portable power pack: assemble a fourcell configuration quickly for a custom portable power solution for compatible devices. Replacement battery pack: swap in a fourcell box for devices that require four 18650 or four 26650 cells, without welding. Onthego backup power: use as a readytouse fourcell pack to provide a compact, replaceable power source for small electronics in outdoor or emergency scenarios.