Description
Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 104050
Capacity: 2500mAh / 9.25Wh (per battery)
Rated voltage: 3.7V
Charge limit voltage: 4.26V (max)
Discharge cut-off voltage: 2.75V
Battery type: Li-Polymer
Dimensions (single): 10 x 40 x 50mm / 0.39 x 1.57 x 1.97 inches
Discharge current: 0.5C (1250mA)
Charge current: 0.5C (1250mA)
Compatible with: Bluetooth Speaker, Hand Warmer, Power Bank, Heating Suit, DIY Electronics, Portable Fans, LED Lights, Small Appliances
Power up your portable electronics with this 2‑pack 104050 2500mAh rechargeable Li‑Polymer battery set. Perfect for hand warmers, Bluetooth speakers, power banks, heating suits (electric jackets/gloves), as well as various DIY electronic projects requiring a compact 3.7V power source. Each battery delivers factory‑rated 2500mAh capacity with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent.
Manufactured with high‑quality Grade A Li‑Polymer cells and equipped with integrated PCM protection board. The protection features include overcharge protection (detection 4.30±0.05V), over‑discharge protection (detection 2.50±0.1V), overcurrent protection (2.5±1.0A), and short circuit protection. With a cycle life of 500 cycles maintaining 80% capacity, these batteries offer reliable long‑term performance. CE, RoHS, and UN38.3 certified for safe transport and use. Operating temperature range: charge 0‑45°C, discharge ‑20 to 60°C — suitable for winter heating devices and outdoor applications.
Compatibility Note: Fits devices that use 104050 battery model with 2‑wire connection (red wire positive “+”, black wire negative “-“). Please verify your device’s original battery model and polarity before ordering. Battery dimensions: 10mm thickness × 40mm width × 50mm length — measure your battery compartment to ensure proper fit. Suitable for DIY electronic products with power consumption less than 9.25Wh. Not suitable for high‑power power tools or model aircraft.
Installation Tip: If your original battery has a different connector, you can carefully cut and solder the wires (red to red, black to black) using heat shrink tubing. Always verify polarity before soldering.
Battery Care Tips: Avoid full discharge — recharge when battery level drops below 20%. Do not expose to high temperatures or direct sunlight. New batteries require 3‑5 full charge cycles to reach optimal capacity. Always use a compatible charger (5V USB charger with charging circuit protection). Store in a cool, dry place when not in use.
✅ Condition: Brand New – Never used, factory‑tested quality
✅ Built‑in Overcharge / Over‑discharge / Overcurrent / Short Circuit Protection
✅ CE / RoHS / UN38.3 Certified
✅ 90‑Day Warranty from delivery – Longer coverage than major platforms
✅ Ships in 3‑7 days with tracking
🛡️ Shipping Protection Available at Checkout
✅ PayPal Buyer Protection included
⚠️ Low Stock Alert: Only 8 left in stock. Order now to avoid waiting.
✅ Why Our Warranty Stands Out
Unlike marketplace sellers with short buyer protection windows, we handle claims directly — no automated disputes, no endless back-and-forth.
| Compare | ✅ Qingsm Tech | ⚠️ eBay / AliExpress |
|---|---|---|
| Warranty Period | 90 days from delivery | 15-30 days from order confirmation |
| When It Starts | 📦 Upon delivery | ⚠️ Upon order confirmation (even before you receive it) |
| Claims Handling | We do it directly — email us | Automated dispute system, seller dependent |
| After Window Expires | Still can contact us for support | No recourse, seller can ignore you |
🔋 90-day warranty is the industry standard for replacement batteries. Batteries naturally lose capacity over time — this normal wear is not covered. Warranty applies to manufacturing defects only.
📦 Shipping Cost & Delivery Time ( Economy Shipping from China )
📦 Note: Batteries are classified as hazardous goods and must be shipped via specialized channels, which may take slightly longer than standard couriers. Delivery times are estimates; actual delivery may be affected by customs, weather, or other unforeseen circumstances.
| Destination | Freight (USD) | Est. Delivery Time |
|---|---|---|
| United States | $7.80 | 8-20 days |
| Canada | $6.80 | 18-45 days |
| Mexico | $10.00 | 30-60 days |
| Germany, France, United Kingdom, Greece | $6.50 | 18-45 days |
| Ireland, Austria, Belgium, Poland, Denmark, Switzerland, Portugal, Norway, Slovakia, Spain, Hungary, Italy, Czech Republic, Luxembourg, Netherlands, Sweden, Cyprus | $8.00 | 18-45 days |
| Croatia, Finland, Lithuania, Latvia, Slovenia | $8.00 | 30-60 days |
| Romania | $14.00 | 30-60 days |
| South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan | $7.50 | 18-45 days |
| United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil | $18.00 | 25-60 days |
* Delivery times are estimates; actual delivery may be affected by customs or other factors. If your country is not listed, we are currently unable to ship batteries to that destination.
🇧🇷 Note for Brazil: Brazilian customs can occasionally cause delays of up to 80 days or more. And please indicate the recipient’s CPF, as it is required for Brazilian customs and shipping. Thanks ! We appreciate your understanding.
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