4S-14S Li-ion Battery BMS 12V-52V 30A Same Port 18650 Battery Pack Balance Protection Board for RV Large Trucks | MKBMS

Style: 4S-7S
Sale price$15.80


Product Description--

Charging current: ≤10A

Discharge current: 30A

Internal resistance: ≤15mΩ

Charging voltage:The number of Li-ion batteryin series connection X 4.2V
Wiring : Same Port


Overcharge protection——

Detection voltage: 4.25±0.025V

Detection delay: 1000±500MS

Release voltage: 4.15±0.05V

Over-discharge voltage protection——

Detection voltage: 2.75±0.1V

Detection delay: 1000±500MS

Release voltage: 3.0±0.1V

Balanced voltage——

Detection voltage: 4.15±0.025V

Detection delay: 100±50MS

Balance current: 42±5MA

Over discharge current protection——

Detection voltage: 50±15MV

Detection delay: 1000±500MS

Current protection: 50±8A

Short circuit protection--

Trigger condition: external short circuit

Detection delay: 300us

Release condition: disconnect the load

Temperature control protection——

Charge and discharge over-temperature protection: 55℃

Charge and discharge high temperature release temperature: 75℃

Release condition:During normal working temperature


Working power consumption: <35UA

Over-discharge power consumption(Sleeping State): <10UA

Operating temperature range: -30°~+80°C


Product Features--

  • Overcharge protection
  • Over discharge protection
  • Overcurrent protection
  • Balanced protection
  • Temperature control protection
  • Applicablefor 4S-7S / 8S-14S Li-ion battery



1* 4-7S BMS PCBA board
1*HY2.0 single head 8P line

Net weight:12.2g



1* 8-14S BMS PCBA board
1*HY2.0 single head 7P line
1*HY2.0 single head 8P line

Net weight:13.3g





1. It is strictly forbidden to insert balance wires into BMS before connecting batteries.Must make sure that the cable is soldered correctly first , and then connect the BMS board.

2. The sequence of connecting wires for BMS:

a.From thin black balance wire to stare, the 2ndwire(thin red wire)connect with the 1stbattery’s positive pole.Then connect each cell’s positive pole in order until the last one B+.
b.Please do not insert the plug directly after the cable is connected.Measure the voltage between each two adjacent metal terminals on the back of the plug. If it is a ternary polymer battery, the voltage should be between 3.0 ~4.2V, and the voltage of the iron-lithium battery should be between 2.0 ~3.6V. The voltage should be between 1.5~2.75V.
c.After confirming that the wiring sequence and voltage of the cables are correct, insert them into the socket of the protection board.

Attentionplease: The cables of different manufacturers are not universal, please make sure to use the matching cables.

3. After the wiring is completed, measure whether the voltage of battery B+and B- ,andthe voltage of B-and C- are equal. If they are equal, the protection board is working normally and can be used normally. If it is not equal, please check the wiring again.

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