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Please don't refer estimated delivery date when you order Total Delivery Days.
We will ship via fast way, you can get the package with 10-30 days.
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This is 606090 3.7V 4000mAh rechargeable lithium polymer battery. It comes with bare red & black wires, you can solder PH2.0, JST or other connectors according to your project requirement. Built‑in protective circuit board, support safe charge and discharge. Features stable output voltage and long cycle life. Perfect replacement battery for power bank, portable bluetooth speaker, LED lighting, GPS device, surveillance equipment and other DIY electronic projects.

Package Includes:1 × 606090 4000mAh 3.7V Li‑po Battery

1. Model 606090 3.7V lithium polymer battery, capacity 4000mAh, large capacity for long working hours of portable devices.
2. Comes with bare red and black wires, convenient for welding and DIY modification, you can solder different connectors as needed.
3. Built‑in protection module, effectively prevent over‑charging, over‑discharging, short‑circuit and over‑current to guarantee safe usage.
4. Stable voltage output and long cycle performance, excellent performance for daily repeated charge and discharge.
5. Widely used for power bank, portable speaker, LED light, GPS tracker, monitoring camera and various DIY electronic equipment.

Maintenance of Lithium Batteries

- Please charge the battery with a dedicated lithium battery charger.
- Lithium batteries have no memory effect; there is no need to fully drain power before recharging.
- Do not drop, impact, squeeze or pierce the battery.
- Do not reverse the positive and negative poles when wiring the battery.
- Do not dispose of the battery into fire or discard it arbitrarily.
- If the lithium battery will not be used for 2 months, store it in a well-ventilated and dry place.

Tips for Lithium Polymer Batteries

- Lithium batteries feature a nominal voltage of 3.7V and a full-charge voltage of 4.2V.
- The capacity of a lithium battery is restricted by its dimensions; larger capacity corresponds to larger size.
- The size of the lithium battery matters and determines compatibility. As a rule of thumb, it can be used if it fits into the original device.
- Lithium batteries are made of aluminum foil which is as thin as paper. Minor scratches on batteries may inevitably occur during production, but we guarantee all cells are brand-new Grade A cells.