6S 25.2V 10A Charge-Only Bypass BMS

The TorqueBoards 6S Charge-Only BMS is designed for compatible 6-series lithium battery packs using a bypass discharge configuration.

In a charge-only or bypass setup, the BMS manages the battery during charging and monitors the individual cell groups through the balance-wire connection. The battery’s main discharge current bypasses the BMS and connects directly to the battery output circuit.

This configuration is commonly used in electric skateboards and other high-current DIY electric-vehicle battery packs where the BMS is used for charging protection and balancing rather than carrying the full motor discharge current.

Key Features

• Designed for compatible 6S battery packs
• Charge-only bypass configuration
• Rated for up to 10A charging current
• Monitors individual series groups through the balance connection
• Helps protect the battery during charging
• Supports cell-group balancing
• Separate P− and B− connections
• NTC temperature-sensor connection
• Suitable for DIY electric skateboard and modular EV battery projects

Bypass BMS Configuration

This BMS is intended to be wired as a charge-only BMS.

In this configuration:

• The charger negative connects through the BMS at P−
• The battery negative connects to the BMS at B−
• The main discharge connection bypasses the BMS
• The vehicle’s discharge current does not pass through the BMS

This allows the battery pack to supply higher discharge current directly to the vehicle while retaining BMS protection during charging.

A bypass BMS does not provide discharge-side overcurrent, short-circuit, or low-voltage cutoff protection for the main vehicle output. Those protections must be handled through proper system design, ESC settings, fusing, monitoring, and safe battery operation.

Specifications

• Series configuration: 6S
• Nominal lithium-ion voltage: Approximately 21.6V
• Maximum lithium-ion charge voltage: 25.2V
• Maximum charging current: 10A
• Configuration: Charge only / discharge bypass
• Connections: P−, B−, balance connector and NTC
• Application: Lithium battery-pack charging, monitoring and balancing

Confirm that the supplied BMS version is configured for your battery chemistry. Lithium-ion and LiFePO4 cells use different charging voltages and protection thresholds and are not interchangeable without the correct BMS configuration.

Common Applications

This BMS may be used with compatible:

• 6S electric skateboard battery packs
• DIY lithium-ion battery builds
• Modular electric-vehicle battery packs
• Drift carts and lightweight EV projects
• Other 6S battery systems using a charge-only bypass configuration

Compatibility depends on battery chemistry, series count, charger voltage, charge current, balance-wire arrangement and complete battery design.

Connection Overview

The primary connections include:

• B−: Battery-pack negative
• P−: Charger negative
• Battery positive: Charger positive connects directly to pack positive in a typical charge-only configuration
• Balance connector: Monitors each battery series group
• NTC: Temperature-sensor connection where supported

Always follow the correct wiring diagram for this exact BMS revision. Do not determine balance-wire order by wire color alone.

What’s Included

• 1x 6S 10A charge-only bypass BMS
• 1x 6S Balance Wire Harness

Temperature sensors, connectors, chargers and additional wiring are not included unless specifically stated in the selected product option.

Important Compatibility Requirements

Before ordering or installation, confirm:

• 6S battery configuration
• Correct battery chemistry
• Correct charger voltage
• Charging current does not exceed 10A
• Correct balance-wire connector and sequence
• Correct P− and B− wiring
• The main discharge path is designed to bypass the BMS
• Additional discharge-side protection is provided where required

This BMS should not be used with a battery pack having a different series count.

Installation and Safety

Connect and verify all balance leads before applying charging power. Each balance-wire reading should increase sequentially as measured from battery negative.

Incorrect balance-wire order, reversed polarity, short circuits or connecting the wrong series count may permanently damage the BMS or battery pack.

Before connecting the charger:

1. Verify every cell-group voltage.
2. Confirm the total pack voltage.
3. Confirm the balance-wire sequence.
4. Verify B− and P− connections.
5. Check charger polarity and output voltage.
6. Insulate all exposed conductive areas.
7. Confirm the main discharge path bypasses the BMS as intended.

Lithium battery packs can cause fire, serious injury or property damage if incorrectly assembled, charged or serviced. Installation should only be performed by someone experienced with battery-pack wiring, balance connections, polarity verification and lithium battery safety.