18V/21V PCB Lithium Battery Protection Board 3MOS for Drills
18V/21V PCB Lithium Battery Protection Board 3MOS for Drills
18V/21V PCB Charging Protection Board – 3MOS for Lithium Battery Packs
Keep your cordless drill's lithium battery pack running safely and efficiently with this robust 18V/21V PCB Charging Protection Board. Built with a reliable 3MOS design, this circuit board guards your battery against overcharge, overcurrent, and damaging temperature extremes — extending battery life and protecting your investment in power tools.
Key Features
- Wide Compatibility: Designed for 18V and 21V lithium battery packs used in electric drills and similar power tools
- 3MOS Protection Circuit: Triple MOSFET design delivers stable, dependable battery management performance
- Overcharge Protection: Automatically cuts charging at the correct voltage threshold with a 1-second protection delay
- Overcurrent Protection: Triggers between 40A–50A to prevent damage from excessive current draw
- Continuous Discharge Current: Supports 8–20A for consistent power delivery during heavy-duty use
- Wide Operating Temperature Range: Functions reliably from -55°C to 120°C (RH ≤ 75%)
- Durable ABS + Metal Construction: Compact and tough housing stands up to workshop conditions
- No Indicator Lamp: Clean, streamlined board without an LED lamp circuit
Specifications
| Charge Voltage | 25V |
| Quiescent Current | 25µA (25°C) |
| Continuous Discharge Current | 8–20A |
| Overcurrent Protection | 40A–50A |
| Overcharge Protection Delay | 1 Second |
| Operating Temperature | -55°C to 120°C, RH ≤ 75% |
| Storage Temperature | -55°C to 175°C, RH ≤ 75% |
| Material | ABS + Metal |
| Dimensions | 90 × 62 × 15 mm (3.54 × 2.44 × 0.59 in) |
| Country of Origin | Made in Mainland China |
What's in the Box
- 1 × PCB Charging Protection Board
Note: The board base plate color (green or blue) is assigned at random. This does not affect performance or functionality in any way.
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Frequently Asked Questions
Q: What voltage lithium battery packs is this PCB protection board compatible with?
A: This PCB charging protection board is designed for 18V and 21V lithium battery packs commonly used in cordless electric drills and similar power tools. The charge cutoff voltage is set at 25V, which is appropriate for these battery configurations.
Q: Does this board protect against both overcharging and overcurrent?
A: Yes. The board features overcharge protection with a 1-second delay and overcurrent protection that activates between 40A and 50A. These safeguards help maintain battery health and prevent damage during both charging and high-load discharge scenarios.
Q: Does the board come with an indicator lamp (LED)?
A: No — this is the "without lamp" version, meaning there is no LED indicator circuit. It is a clean, streamlined board suited for direct integration into battery pack housings where an indicator light is not required.
Q: Can I choose the color of the board base plate?
A: The base plate color (green or blue) is assigned randomly at the time of packing. Both colors are functionally identical and perform the same way.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.