Skip to product information
1 of 7




Regular price $105.00 USD
Regular price Sale price $105.00 USD
Sale Sold out

This BMS is a great choice for custom VESC™ build applications where charge only protection is desired. Works across a wide range of battery packs all the way up to 126 volts (30s)!

This 4S-30S 20A Charge Only BMS is designed to reduce the risk of charging. Designed to be ultra-compact and simple to use without any configuration required. Features high charging current, balancing activity LED lights, overcharge, and over temperature protection. Used in electric bicycles, electric scooters, Onewheels and other fields.

MKBMS 4S-30S 20A Charge Only BMS does NOT support discharge protection, please do not discharge through this protection board.


Type: Charge only

Cell Chemistry: Li-ion (3.7V nominal)

Balance method: Passive balance

Series Count: 4-30S

Max Charge Current: 20A (BMS max. Please reference your battery Max)

Overcharge Voltage: 4.25V

Overcharge Reset: 4.19V

Balance:20-30mA@4.2V(Please balance the battery first before charging)

Overtemperature: 60°C

Overtemperature Reset: 40°C

Size: 130*30*11mm

Net weight: 30g


  1. Compact charge only design
  2. Cell balance indicator LED
  3. Compatible with 4s-30s battery
  4. Designed to be ultra-compact and simple to use without any configuration required
  5. Anodized aluminum heatsink case, stable performance


  1. Balance function
  2. Overcharge protection
  3. Overtemperature protection
  4. Cell balance indicator LED

Common Uses:

▪ One-wheeled electric skateboards

▪ Electric Skateboards

▪ Electric Scooters

▪ Electric Bikes

▪ EUCs

Package Included:

1* MKBMS 4S-30S 20A Only Charge Board

1* JST PH2.0 single head 15P line

1* JST PH2.0 single head 16P line

1* JST PH2.0 single head 2P cable with thermal protection switch

1* Charging cable with XT30 connectors

Operation Notes:

  1. Please ensure the correctness of the wiring sequence, from B0-B15, B16-B30, the voltage increases from low to high in sequence.
  2. This BMS is compatible with battery packs up to 30s, which is over 125V DC when fully charged. Electric shocks from high voltage may cause serious injury. Please pay attention to safety when using.
  3. This device is designed to reduce the risk of charging and will not protect against overcurrent discharge, undervoltage, internal pack shorts, pack overtemperature.
View full details

Customer Reviews

Be the first to write a review