357090 3.7V 4000mAh BMPro BM Pro plus Lithium ion polymer Battery

The 357090 3.7V 4000mAh BMPro BM Pro plus Lithium ion polymer Battery delivers a stable 3.7 V nominal output and a high 4000 mAh capacity (≈14.8Wh), making it a reliable power solution for portable electronics, DIY projects, and embedded systems that require consistent, lightweight energy storage.

Li-Po batteries are thin, lightweight, and energy-dense, offering fast charge times and reliable charge retention.

These will work in most BMPRO and BM Pro Plus systems. Please compare the connector type, battery size, and voltage with your original battery before purchase to ensure compatibility. The connector can also be cut or swapped out with ease if required.

Model Series Information

Model: 357090

Dimensions: 3.5 mm (thickness) ×69 mm (width) × 88mm (length)

Dimensional tolerance: ±5%

Suppose you need a larger or a smaller one! battery, we have an extensive range of Lithium-ion polymer batteries.

When fully charged, the battery reaches 4.2 V and operates around its nominal 3.7 V during discharge. An integrated protection circuit safeguards the cell against overcharging, over-discharging, and short circuits. The battery will automatically disconnect when the voltage drops to approximately 2.7 V, preventing damage and extending overall service life.

Charging must be performed with a dedicated Li-Po CC/CV charger. Tempero Systems recommends a charge rate of 0.5C or lower. As with most Li-Po batteries, this model does not include a built-in temperature sensor (thermistor).

The battery is supplied with a factory-fitted Red and Black Tinned cable and includes all required protection circuitry.

Important Note This battery is not suitable for high-current applications, such as RC cars, aircraft, drones, or other devices that require high discharge rates. Such applications require high-rate Li-Po batteries with continuous discharge ratings of 5C and above.

Battery Specifications:

• Model: 357090

• Brand: Tempero - Bihuade-Litre Energy Battery

• Battery Chemistry: Lithium-Ion Polymer (Li-Po)

• Nominal Voltage: 3.7 V

• Nominal Capacity: 4000mAh

• Energy Rate 14.8Wh

Electrical Characteristics: Lithium-ion polymer Li-Po

• Standard Charging Method:

  • 0.5C constant-current (CC) charge to 4.2 V

  • Followed by constant-voltage (CV) charging at 4.2 V until charge current drops to ≤0.01C

• Recommended Charge Current:

  • 0.2C (800mA)

• Maximum Charge Current:

  • 0.5C (2000mA)

• Maximum Discharge Current:

  • 1C

• Discharge Method:

  • Constant current at 0.2C

  • End-of-discharge voltage: 2.75 V

• Cut-Off Voltage (Protection):

  • 2.75 V (over-discharge protection)

• Charge Voltage (CV):

  • 4.2 V (nominal), ≥3.85 V operating

Mechanical & Physical

• Connector Type: JST PH2.0
  • Current rating: ~2 A per contact (AWG #22)
  • Voltage rating: ~125V AC/DC
  • Contact Resistance: ≤ 20 mΩ
  • Insulation Resistance: ≥ 100 MΩ
  • Dielectric Withstanding: 500 VAC for 1 min between adjacent circuits
  • Temperature range: –25 °C to +85 °C
  • Cable Length: 80 mm ±5%
• Cable Orientation: See Photo More Information
• Dimensions (T × W × L): 3.5× 69× 88mm±5%
• Weight 28.4g ±5%

Cycle Life (Capacity Retention)

• ≥92% after 100 cycles

• ≥88% after 300 cycles

• ≥80% after 500 cycles

Environmental Conditions

• Charging Temperature: 0°C to 45°C

• Discharging Temperature: 10°C to 60°C

• Storage Temperature: −5°C to 35°C

• Relative Humidity: 65% ±20% RH

WARNING – LITHIUM-ION BATTERY SAFETY

Lithium-ion cells are high-energy power sources and must be handled with extreme care. Improper use, charging, or storage may cause the battery to overheat, ignite, or explode, resulting in serious injury, fire, or property damage.

Batteries damaged due to misuse, abuse, or the use of non-compliant chargers or equipment cannot be replaced.

• Overcharging:Always use a suitable Li-ion/Li-Po charger and ensure the charge voltage does not exceed the battery\'s specified full-charge voltage.

• Over-discharging:Ensure the connected equipment does not draw current beyond the stated maximum continuous discharge current. Do not operate the battery below its specified cut-off voltage.

• Deep Discharge Storage:Do not leave the battery fully discharged for extended periods, as this may cause irreversible damage and permanent capacity loss.

• Fire and Heat Exposure:Do not place the battery in fire, expose it to excessive heat, or leave it in direct sunlight.

• Incorrect Installation:Never install the battery with reversed polarity. Always verify positive (+) and negative (−) connections before use.

• Short Circuit:Do not connect the battery\'s positive and negative terminals with metal objects or allow them to come into contact.

• Moisture Exposure:Do not expose the battery to water, saltwater, or excessive moisture. Do not allow the battery to get wet.

• Disassembly or Modification:Do not disassemble, puncture, crush, or modify the battery. The battery contains internal safety and protection components that may be damaged if altered.

Additional Safety Notes: Lithium-ion polymer Li-Po

• Use the correct charger only:Never use NiMH, NiCd, or lead-acid chargers. Always charge this battery using a dedicated Lithium-ion/Li-Po charger.

• Do not leave unattended:Never charge or operate the battery without supervision.

• Inspect before and during use:Regularly inspect the battery, wiring, and surrounding circuitry for damage, loose connections, or potential short circuits.

• For experienced users only:Lithium-ion polymer batteries are high-energy power sources and should only be used by individuals experienced and confident in working with power supplies.

Important Connection Note: Lithium-ion polymer

There is no industry-wide standard for battery cable orientation.Before connecting, verify that the polarity and cable orientation match your device.An incorrect connection may permanently damage the battery and the connected equipment.