5S 21V 10A / 15A / 20A / 25A Lithium Battery Protection Board (BMS)
The 5S 21V lithium battery protection board is designed for equipment that requires stable, high-current output—such as power tools, cordless cleaning machines, garden tools, e-bikes, energy storage modules, and industrial portable devices.
It provides precise cell monitoring, fast short-circuit response, MOSFET-level current control, and reliable overcharge and over-discharge protection to ensure long-term battery safety.
This BMS supports full OEM/ODM customization, including discharge current options (10A/15A/20A/25A), PCB layout, wire harness design, connector selection, and functional upgrades such as temperature sensors or communication modules.
All units come with a 3-year warranty, offering long product life and strong assurance for commercial and industrial applications.
Descrição
5S 21V 10A / 15A / 20A / 25A
Lithium Battery Protection Board – BMS Specifications
The 5S 21V lithium battery protection board is engineered for high-performance applications such as power tools, cordless cleaning machines, portable energy equipment, and other devices requiring stable high-current output.
This BMS provides precise cell-level voltage monitoring, reliable overcurrent protection, fast short-circuit response, and effective MOSFET temperature control to ensure system safety under demanding load conditions.
Designed for 5S 18650 / 21700 lithium-ion cells, the system delivers full protection for 21V battery platforms. Customizable discharge current, size, protection thresholds, and wiring layouts are available to meet OEM/ODM requirements.
5S 21V 10A / 15A / 20A / 25A BMS Specifications
| Basic Project | Specifications | Unit |
|---|---|---|
| Discharge | ||
| Continuous discharge current | 10 / 15 / 20 / 25 | A |
| Instantaneous (start-up) current | 20 / 30 / 40 / 50 | A |
| Charge | ||
| Charging voltage | 4.25 ± 0.025 | V |
| Continuous charging current | 10 / 15 / 20 / 25 | A |
| Overcharge Protection | ||
| Overcharge detection voltage | 4.25 ± 0.025 | V |
| Overcharge detection delay | 0.5 | s |
| Overcharge release voltage | 4.25 ± 0.05 | V |
| Over-discharge Protection | ||
| Over-discharge detection voltage | 2.7 ± 0.05 | V |
| Over-discharge detection delay | 0.1 | s |
| Over-discharge release voltage | 3.0 ± 0.05 | V |
| Overcurrent Protection | ||
| Overcurrent detection voltage | / | mV |
| Overcurrent detection delay | 350 | ms |
| Overcurrent protection current | 10 ± 1 | A |
| Overcurrent release condition | Charging recovery or load disconnection | — |
| Short-circuit Protection | ||
| Short-circuit condition | External load short circuit | — |
| Short-circuit detection delay | 250 | μs |
| Short-circuit release condition | Charging recovery or load disconnection | — |
| Temperature Protection | ||
| Operating temperature range | –20 ~ +70 | °C |
| Internal Resistance | ||
| MOSFET internal resistance | ≤ 30m | mΩ |
| Size of Protection Board | As detailed in specification sheet | mm |
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