The Lithium Battery BMS Protection & Charging Module is a 4S board designed to manage and safeguard a pack of four lithium cells connected in series, with a 16.8V charge voltage and a 40A current rating. It balances the cells while charging and protects the pack during everyday use, making it a practical choice for DIY battery builds, solar storage banks, e-bike and scooter packs, portable power setups, and small off-grid or irrigation power projects.
Key features
- Built for 4S lithium packs (four cells in series) at a 16.8V charge level.
- Rated for 40A current, suitable for moderate-draw devices and tools.
- Helps protect against overcharge, over-discharge and short circuit.
- Compact board that fits inside most battery enclosures and project boxes.
- Commonly used as a standard replacement in 4S lithium-ion battery builds.
Typical uses
- Assembling or repairing 4S lithium battery packs at home or in a workshop.
- Solar and backup energy storage banks for small systems.
- E-bikes, scooters, power tools and portable power stations.
- Off-grid lighting and small irrigation or pump power setups.
How to choose / tips
- Confirm your pack is 4S and uses a 16.8V charger to match this module.
- Pick a current rating with headroom above your device's normal draw.
- Keep wiring short and connections tight for reliable performance.
- Mount the board where it stays clean, dry and ventilated.
Why tna W rna
At tna W rna we focus on quality components and reliable sourcing, so you get parts that do the job. Enjoy fast delivery across Egypt and the convenience of cash on delivery.
