Smart ANT BMS 17S-24S 550A – Active Balancing Battery Management System

The Smart ANT BMS 17S-24S 550A is an intelligent battery management system module built for electric motorcycles, high-power e-bikes, go-karts and electric scooters. It also serves mobile and industrial energy storage systems. The board controls packs from 17S to 24S. Moreover, it handles 220 A continuous discharge current and 550 A peak current, while active balancing evens out individual cell voltages.

This unit is not a battery and not a charger. Instead, it connects between the pack, the load and the charger. Therefore, the entire discharge and charge flow passes through the MOSFET transistors. The BMS interrupts that flow the moment a fault appears. Supported chemistries include lithium-ion (NMC/NCA) and lithium iron phosphate (LiFePO₄) cells.

In a Li-ion pack the voltage range reaches roughly 61-100.8 V. In an LFP pack the same series count gives approximately 54.4-76.8 V. Bluetooth / UART communication is also built in. As a result, you adjust parameters through the app in real time and watch the pack while it works.

Key Benefits

• Active balancing – energy moves between cells instead of being dissipated as heat, so voltages level out faster.
• More usable capacity – balanced cells release more Wh from the same pack, and the board itself runs cooler.
• 220 A continuous discharge – enough for demanding e-motorcycle controllers under sustained heavy load.
• 550 A peak current – hard launches and sudden acceleration will not trip the protection.
• Wide series range – a single module covers 72 V, 84 V and 96 V class Li-ion packs.
• Complete protection set – overcharge, deep discharge, short circuit and overheating are all covered.
• NTC temperature sensors – these monitor pack temperature and power switch temperature during operation.
• Smart monitoring – Bluetooth / UART shows cell voltages, current and state of charge (SOC).

Who Is This BMS For?

This board suits electric motorcycles, high-power electric bicycles, go-karts and electric scooters. In addition, it is used in mobile energy systems and industrial energy storage installations. In every case the pack must consist of 17 to 24 cells wired in series.

In practice that means 72 V, 84 V and 96 V class Li-ion packs. A 20S Li-ion pack, for example, falls directly inside this range. A fully charged 24S Li-ion pack sits at roughly 100.8 V. LiFePO₄ static packs with the same series count deliver lower voltage, from about 54.4 V up to 76.8 V.

The product is aimed at battery pack builders and tuning workshops. Furthermore, e-motorcycle owners who assemble their own packs choose it when they need high current together with per-cell monitoring in an app.

Technical Specifications

Installation Notes

• Connect the balance wires B-, B1, B2 … Bn exactly in cell order.
• Fit a fuse close to the battery pack.
• Provide heat dissipation away from the power section of the board.
• Run the first power-up under limited load with live app monitoring.

The balance wire sequence is critical. If the connections are mixed up, the board can be destroyed immediately. Therefore, check the wiring diagram twice before the first power-up.

Why Choose the Smart ANT BMS 17S-24S 550A?

The main difference from cheaper boards is active balancing. Passive designs simply burn off surplus energy as heat. This module transfers that energy between cells instead. Consequently, the pack levels out faster and the board stays cooler under load.

The current headroom is the second reason. A 220 A continuous rating covers sustained high-load riding, while the 550 A peak absorbs short bursts at launch. Both figures apply to the same board, so one module suits 72 V, 84 V and 96 V builds.

Finally, the Bluetooth / UART link turns the pack into something you can actually read. Cell voltages, current and state of charge appear in the app while you ride. Because parameters are adjustable in real time, tuning a new pack becomes far quicker.

Frequently Asked Questions

Which vehicles is this BMS suitable for?

• Electric motorcycles, high-power e-bikes, go-karts and electric scooters.
• It also works in mobile and industrial energy storage systems.
• The pack must use 17 to 24 cells in series.

Does it fit a 20S Li-ion pack?

• Yes, 20S sits directly inside the supported 17S-24S range.
• A 24S Li-ion pack reaches about 100.8 V when fully charged.
• One module therefore covers 72 V, 84 V and 96 V class builds.

Which cell chemistries are supported?

• Lithium-ion cells in NMC and NCA formats.
• Lithium iron phosphate (LiFePO₄) cells.
• LFP packs run at roughly 54.4-76.8 V across the same series range.

How much current can it handle?

• 220 A continuous discharge current.
• 550 A peak current for short bursts.
• All discharge and charge current passes through the MOSFET transistors.

What does active balancing actually do?

• It moves energy between cells rather than dissipating it as heat.
• Cell voltages level out faster as a result.
• Balanced cells release more Wh from the same pack.

Which protections are included?

• Overcharge, deep discharge, short circuit and overheating protection.
• NTC sensors track pack and power switch temperature during use.
• The BMS cuts the current path when a fault is detected.

How do I monitor the pack?

• Through the Bluetooth / UART connection.
• The app displays cell voltages, current and state of charge.
• Parameters can be changed in real time.

Is this a charger or a battery?

• No, it is neither. It is a control board only.
• It connects between the pack, the load and the charger.
• Fit a fuse near the pack during installation.

The Smart ANT BMS 17S-24S 550A brings active balancing, 220 A continuous current and app-based cell monitoring to one board. Wire the balance leads carefully, add a fuse near the pack, and run the first test under limited load. After that, your 72 V, 84 V or 96 V build stays balanced, protected and fully visible in the app.