eMagTech 5 Pack 18650 Lithium Battery BMS Protection Board 1S 10A 4 MOS 3.7V for Single Cell Builds with Overcharge Overdischarge Overcurrent Short Circuit

1S 3.7V 18650 BMS module supports one cell lithium ion and is compatible with 18650 pack builds for power bank repair, flashlight projects, small audio devices, and STEM learning kits. 10A 4 MOS protection board balances charge and discharge to support stable current delivery. Suited for one cell builds that need efficient cutoff during high load events without complex wiring. Overcharge and overdischarge protection adds overcurrent response and short circuit defense to guard the cell. Helps extend service life during daily cycling in portable gear and DIY applications. Compact 18650 PCB module offers clear solder pads for fast assembly and replacement. Lightweight format fits tight spaces in handheld tools, custom speakers, sensors, and classroom electronics projects. DIY battery pack applications include home bench work, maker labs, student practice, and field prototypes. Builds or refurbishes single cell packs for flashlights, toys, emergency gadgets, and small wearables.