14S 52V 30A BMS – Complete protection for your 52V Li-Ion battery pack
Whether you are building a new 14S battery pack or refurbishing an existing one, you need a reliable Battery Management System that does more than just connect the wires. You need a unit that actively monitors every individual cell, reacts instantly to overheating, and ensures long-term cell balance. This 14S 52V 30A BMS board delivers exactly that, all in a compact 65 × 50 × 9 mm footprint that fits easily into most battery casings.
Note: This product is intended for users with experience in working with Li-Ion battery packs. Please ensure you verify polarities and connection sequences carefully before powering on.
Why choose this model? (Key advantages):
- 4-Way Protection — Comprehensive safety against overcharge, over-discharge, overcurrent, and short circuits, all active simultaneously without the need for extra configuration.
- Passive Balancing at 4.2V per cell — Automatically compensates for capacity differences between cells during every charge cycle, potentially extending your battery pack’s lifespan by 20–30%.
- Automatic Thermal Cut-off at 75°C — Stops discharge before temperatures reach dangerous levels; operation resumes automatically once the unit cools down, with no manual reset required.
- 30A Nominal, 35A Peak — Perfectly suited for motors ranging from 500W to 1000W at 52V, ensuring reliable performance during acceleration or steep climbs without nuisance tripping.
- Compact Design — Weighing just 60 grams and only 9 mm thick, it fits seamlessly into e-bike frames, scooter housings, or hoverboards without requiring structural modifications.
Performance and Specifications
This board manages a series chain of 14 Li-Ion cells, maintaining a 52V nominal operating voltage. The 4.25V per cell overcharge threshold halts the charging process before cell chemistry is compromised, while the 2.6V per cell deep-discharge limit protects your battery’s long-term capacity—as most irreversible degradation occurs below this threshold. Passive balancing engages automatically once the first cell reaches 4.2V, dissipating excess energy to allow the remaining cells to catch up.
| Parameter | Value / Detail |
|---|---|
| Model | 14S 52V BMS |
| Series Cell Count | 14S |
| Nominal Voltage | 52V |
| Nominal Current | 30A |
| Peak Current | 35A |
| Deep Discharge Protection | 2.6V / cell |
| Overcharge Protection | 4.25V / cell |
| Cell Balancing Voltage | 4.2V / cell |
| Discharge Thermal Protection | 75°C |
| Charge Thermal Protection | -7°C |
| Dimensions | 65 × 50 × 9 mm |
| Weight | 60 g |
| Compatible Battery Chemistry | Li-Ion |
Package Contents
- 1 × 14S 52V 30A BMS Board
Frequently Asked Questions
Which battery types is this BMS compatible with?
It is designed exclusively for Li-Ion batteries in a 14S configuration (14 cells in series, 52V nominal). It is not recommended for LiFePO4 or LiPo chemistries without prior verification of cell voltages, as the protection thresholds are specifically calibrated for Li-Ion.
Does it manage both charging and discharging?
Yes. The board controls both circuits—discharging at 30A nominal (35A peak) and charging with built-in overvoltage and low-temperature (-7°C) protection. You do not need a separate module for each direction.
What happens after a 75°C thermal cut-off?
The BMS automatically stops the discharge process and resumes normal operation once the temperature drops below the safety threshold. The process is fully automatic and requires no manual reset.
Is this sufficient for a 1000W motor on a 52V e-bike?
Yes. At 52V, a 1000W motor typically draws approximately 19A under normal conditions. The 30A nominal current provides a comfortable margin, while the 35A peak handles startup loads or steep inclines without triggering the protection circuits.
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