602030 300mAh 3.7V Li-Polymer Battery with Metal Contacts Solder Pads for DIY Electronics

Description

Battery model: 602030 (also known as KM602030)
Capacity: 300mAh / 1.11Wh
Rated voltage: 3.7V
Charge limit voltage: 4.2V
Battery type: Li-ion Polymer
Connection type: Metal contact pads (positive and negative poles) – no wires pre-attached
Dimensions: 6.0mm (Thickness) × 20mm (Width) × 30mm (Length)
Package include: 1 x battery
Power your DIY electronics projects with this 602030 300mAh Li-ion Polymer battery. Unlike standard batteries with pre-attached wires or JST connectors, this battery features bare metal contact pads (positive and negative poles) — a design preferred by makers, engineers, and repair technicians who need direct PCB soldering or spring contact integration. The 602030 format (6.0mm thick × 20mm wide × 30mm long) is a compact, rectangular lithium-polymer cell commonly used in small portable devices. This battery delivers 300mAh capacity at 3.7V nominal voltage with a 4.2V charge limit, providing reliable power for a wide range of low-power applications. Built with grade A cells and multi-layer safety protection against overcharge, over-discharge, and short circuits. CE, RoHS, and UN38.3 certified for safety.
Why Choose Metal Contact Version — And Where to Use It: Most small Li-Polymer batteries come with pre-attached wires (usually 50-100mm) and a micro connector. While convenient for prototyping, these wires add bulk, create potential failure points (broken solder joints at the battery tab), and take up valuable space inside compact devices. The metal contact version eliminates these issues — you solder the battery directly to your PCB or use spring-loaded contacts, saving space and creating a more permanent, reliable connection. This battery is ideal for: Bluetooth earphones and headphones (replacing worn-out cells), smart watches and fitness trackers, mini RC vehicles and drones, portable game consoles mods, small IoT sensors and nodes, DIY power banks, and other compact gadgets where space is at a premium. Typical applications include replacing batteries in devices originally using soldered-in LiPo cells. If your device uses a battery with soldered tabs rather than a connector, this is the correct replacement type. Always confirm polarity (+/-) before soldering — incorrect polarity will damage both the battery and your device. The exposed metal pads are clearly marked with positive and negative indicators on the battery surface.
Compatibility Note: This battery is a general-purpose component, not a direct replacement for a specific commercial device. Before purchasing, verify your device’s voltage requirement (3.7V nominal, 4.2V max charge), available physical space (must accommodate 6×20×30mm), and connection type (metal pads for soldering or spring contacts). This battery does NOT include wires or connectors — if your device requires a pre-wired battery with a JST or other connector, please choose the appropriate variant. Always measure your original battery’s dimensions and check polarity orientation. This battery is not compatible with devices requiring higher voltage, different battery chemistry, or dimensions larger/smaller than 6×20×30mm.