3.91 €
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4S 40A PCB Protection Board for Lithium Battery
Brand: satkit
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3.91€
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4S 40A PCB Protection Board for Lithium Battery, improved version
This protection board is designed for lithium batteries in a 4S configuration, with a nominal voltage of 16.8V and a maximum continuous discharge current of 40A, ideal for applications that require high power and safety.
Main features
- Compatible nominal voltage: 3.6V or 3.7V per cell, including 18650, 26650 and lithium polymer batteries.
- Charging voltage: 16.8V to 18.1V.
- Continuous discharge current: up to 40A (recommended to reduce if cooling is insufficient).
- Continuous charge current: up to 20A.
- Device type: voltage regulator for battery protection and management.
- Balancing current: 100mA to maintain cell health.
- Available versions: standard (without balancing function, power up to 135W) and balanced (with balancing function, power up to 220W).
Technical specifications
- Requires batteries with minimum power: three 15C-20C batteries or six 10C-15C batteries for a successful start.
- Wiring must be followed strictly according to the voltage map: 0V, 4.2V, 8.4V, 12.6V and 16.8V to avoid short circuits.
- It is recommended to connect a non-polar capacitor (10uF-100uF, voltage >25V) between the positive and negative terminals of the motor to avoid reverse spikes.
- For batteries in series, make sure each group has the same voltage; if not, charge each battery separately before using them in series.
Typical uses and compatibility
This board is ideal for protecting lithium batteries used in electric vehicles, energy storage systems, drones and other electronic devices that require high current and advanced protection. Compatible with 18650 cylindrical batteries, 26650 and lithium polymer batteries in 4S configuration.
Differences between standard and balanced versions
- Standard version: suitable for starting currents below 80A and maximum power of 135W, without balancing function.
- Balanced version: supports starting currents below 80A and maximum power of 220W, includes balancing function to extend battery life.
Package contents
- 1 x 4S 40A improved PCB protection board for lithium battery.
- Compatible with 3.6V and 3.7V cells including 18650, 26650 and lithium polymer batteries
- Up to 40A continuous discharge current for high performance
- Up to 20A continuous charge current
- 100mA balancing current in the balanced version
- Compatible with 4S 16.8V configurations
- Standard and balanced versions to suit power and balancing needs
- Requires batteries with minimum 15C-20C or 10C-15C rating for safe start-up
- Includes guidance to help prevent short circuits and reverse spikes
Customer Questions & Answers
What are the physical dimensions and approximate weight of the 4S 40A protection board?
Specific dimensions and weight are not stated in the description provided. Typically, boards of this type measure around 60-70 mm long and 15-20 mm wide, with a weight of less than 20 g. It is advisable to consult the manufacturer’s datasheet if exact figures are required.
What connection and installation precautions are critical to avoid faults or short circuits when installing this PCB?
It is essential to follow the wiring sequence: connect exactly according to the 0 V, 4.2 V, 8.4 V, 12.6 V and 16.8 V map. A deliberate short circuit must never be made. Before using in series, all cells must be balanced to the same voltage. In addition, it is recommended to fit a non-polar capacitor (>25 V, 10-100 μF) across the motor terminals to protect against reverse spikes.
What current limits does the board support, and what happens if these values are exceeded during charging or discharging?
The board supports up to 40 A continuous discharge and 20 A continuous charge. If these values are exceeded, especially if cooling is inadequate, the risk of overheating, irreversible damage to the board components or even safety failures increases significantly. It is recommended not to operate continuously near these maximum limits.
Which battery types is this protection board compatible with?
It is compatible with lithium batteries with a nominal voltage of 3.6V or 3.7V, including 18650 cylindrical batteries, 26650 and lithium polymer batteries in 4S configuration.
What is the difference between the standard and balanced versions of this board?
The standard version does not include a balancing function and supports up to 135W, while the balanced version includes a balancing function and supports up to 220W, helping to extend battery life.
How should the protection board be installed to avoid damage?
Wiring must be followed strictly according to the voltage map 0V, 4.2V, 8.4V, 12.6V and 16.8V. In addition, it is recommended to connect a non-polar capacitor between the positive and negative terminals to avoid reverse spikes.
What maximum current does the board support for continuous discharge and charge?
It supports a maximum continuous discharge current of 40A and a maximum continuous charge current of 20A, although it is recommended to reduce the current if cooling is insufficient.
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