Li-ion Battery Charger Protection Module (BMS) 4S 30A 14.8V Common Port with Balancing
This protection module is designed for 4-cell series (4S) lithium-ion battery packs with a nominal voltage of 14.8V. It combines over-current-capable switching with per-cell balancing in one compact green PCB measuring 62 × 45 × 1.5 mm, as printed directly on the board alongside the model code CF-D34S30A-B and production code 21K05.
Features
- 4S li-ion protection for 14.8V nominal packs with integrated cell balancing.
- Common-port design – one shared negative terminal (C−) for both charging and discharge, simplifying wiring.
- 5-pin white JST-style balance connector for reliable cell-tap connection.
- Compact PCB: 62 × 45 × 1.5 mm as printed on the board; green solder mask.
- Mounting-ready: four corner holes plus slotted ventilation cut-outs.
Specifications
| Product Type | Li-ion battery charger protection module with cell balancing |
|---|---|
| Battery Configuration | 4S (4 cells in series), 14.8V nominal li-ion pack |
| Model / PCB Silkscreen | CF-D34S30A-B |
| Max Continuous Current | 30A |
| Weight | 15 g |
| Balancing | Integrated |
| Cable Lengh | 35 cm |
| Current-Sense Resistors | SMD resistors marked R005 on board |
| PCB Dimensions | 62 × 45 × 1.5 mm |
| PCB Color | Green |
| Mounting | 4 corner mounting holes + slotted cut-outs |
| Printed Production Code | 21K05 |
Applications
- 4S 14.8V li-ion battery packs
- E-bike, e-scooter and electric mobility battery packs up to 30A.
- Portable power stations, backup/UPS battery boxes and solar storage packs.
- LED lighting, inverters and other equipment powered by 4S li-ion batteries.
Package Content
- 1 × Li-ion Battery Charger Protection Module (BMS) 4S 30A 14.8V Common Port with Balancing
- 1 × 5-Pin Balance Wire Harness Cable with JST Connector
