ASOL 606090 3.7V 4000mAh Lithium Polymer Battery Cell

We test every production batch and provide a capacity verification report with your order. Our QC standard requires ≥3800mAh at 0.2C discharge before shipment. If you receive cells below spec, we replace them — no questions asked. Some generic 4000mAh listings may deliver lower real capacity. ASOL competes on verified batch quality, not inflated claims.

Yes — if three conditions match. (1) Dimensions: Your device bay must accommodate 6×60×90mm (±1mm). (2) Connector: The default is JST PH 2.0mm; we can customize to match your device's connector. (3) Voltage: Must be 3.7V nominal (4.2V max charge). Pro tip: Before ordering, measure your old battery and photograph the connector. Send us the photo, and we will confirm compatibility within 24 hours.

Yes. The default configuration ships with a JST PH 2.0mm female connector soldered to the PCB and 50mm wires. If you need a different connector (JST XH, Molex, ZH, PH 1.25mm, bare wire, etc.), specify it when ordering — we confirm customization scope during project review.

Yes. Every ASOL 606090 ships with the protection PCB integrated directly onto the cell. This is not an "optional add-on." The PCB provides overcharge, overdischarge, short circuit, and temperature protection as standard.

Yes. We can provide UN38.3 test reports, MSDS sheets and supporting documents for air freight, import clearance and OEM project documentation. Request the compliance package with your order.

MOQ is confirmed after specification review. Sample evaluation may be available for selected cylindrical and lithium polymer battery projects, subject to specification review and product availability. Sample freight is paid by the customer.

Run a simple calculation. Runtime (hours) = 14.8Wh / Device Power Consumption (W). For example: a Bluetooth speaker drawing 1.2W →14.8 / 1.2 ≥12.3 hours. A GPS tracker reporting hourly at 0.05W average →14.8 / 0.05 ≥296 hours (~12 days). Not sure about your device's power draw? Email us your specs and we will estimate it for you.

Store at 15°C ~ 25°C, at 40~60% charge (approximately 3.7~3.8V), away from direct sunlight and metal objects. Do not store fully charged or fully discharged for extended periods. Under recommended conditions, shelf life is 12+ months with <10% capacity loss. For long-term storage (>3 months), check voltage every 3 months and recharge to 40~60% if below 3.6V.

Yes, but with caution. We support 1S2P (7400mAh) and 2S1P (7.4V) configurations with matched cells for OEM orders. If you plan to build your own pack, ensure cells are from the same batch and at equal voltage before connecting. We offer pre-matched cell pairs with identical internal resistance for your DIY builds — ask for this service when ordering.

Yes — this is what we do best. We provide: Custom heat-shrink sleeve with your brand logo; Custom product labels (barcode, specs, warnings); Project packaging (blister card, box or polybag); Insert cards with your branding and QR codes; SKU and tracking label support. Private-label requirements and production timing are confirmed during project review.

The standard wiring is Red = Positive (+) / Black = Negative (-) — same as virtually all consumer electronics. The JST PH 2.0mm connector follows the standard pinout (Pin 1 = +, Pin 2 = -). If your device uses reversed polarity, please notify us before ordering. We strongly recommend verifying polarity with a multimeter before installation — reversed polarity can permanently damage your device.