3.7V 4000mAh 18650 lithium‑ion battery pack pre‑wired JST 2‑pin connector. High capacity rechargeable battery for LED lamps, bluetooth speakers, portable fans & DIY electronics.

✅ Specifications:18650 cells, Nominal Voltage:3.7V, Rated Capacity:4000mAh, Full charge voltage:4.2V

✅ Pre‑wired JST‑PH 2‑Pin Connector:Ready to use, no extra soldering required

✅ High‑Capacity Design:4000mAh large capacity for longer working hours of portable equipment

✅ Wide Application:LED lights, bluetooth speakers, portable fans, toys, monitoring devices, DIY electronics kits

✅ Stable Output:Consistent voltage performance, good cycle life

This 3.7V 4000mAh 18650 lithium‑ion battery pack is pre‑assembled with JST‑PH 2‑pin plug, eliminating complicated soldering work for your projects.

High‑capacity 4000mAh provides much longer runtime compared with standard small‑capacity batteries. Nominal voltage 3.7V, max full‑charge voltage 4.2V, stable power output for low‑medium power portable devices.

Application Scenarios:
???? DIY electronic projects & experimental kits
???? LED lights, reading lamps, strip lights
???? Portable bluetooth speakers, mini fans
???? Smart toys, surveillance accessories, small portable appliances

Safety Important Reminder:
• Only use dedicated 3.7V‑4.2V lithium‑ion battery charger
• Prohibit over‑charging, over‑discharging, short‑circuiting, disassembling or piercing battery
• Keep away from high temperature, moisture and open fire

Product Parameters:
‑Battery Cell:18650 Lithium‑ion
‑Nominal Voltage:3.7V
‑Rated Capacity:4000mAh
‑Full‑charge Voltage:4.2V
‑Connector:JST‑PH 2‑Pin with red & black wire
‑Pre‑wired finished battery pack