Description
Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 805080
Capacity: 4000mAh / 14.8Wh (per battery)
Rated voltage: 3.7V
Charge limit voltage: 4.26V (max)
Discharge cut-off voltage: 2.75V
Battery type: Li-Polymer (with built-in PCM protection board)
Dimensions (single): 8 x 50 x 80mm / 0.31 x 1.97 x 3.15 inches
Discharge current: 0.5C (2000mA)
Charge current: 0.5C (2000mA)
Connection: 2-wire pigtail (Red wire “+” Positive, Black wire “-” Negative) — no connector
Compatible with: Back Clip Power Bank, Mobile Power, Portable Charger, DIY Battery Pack, LED Light, Speaker, DIY 3.7V Electronic Projects
Power up your portable charging devices with this 2‑pack 805080 4000mAh rechargeable Li‑Polymer battery set. Perfect for back clip power banks (phone battery cases with built‑in charger), mobile power banks (external battery packs), portable chargers, DIY battery packs, and various 3.7V electronic projects. Each battery delivers factory‑rated 4000mAh capacity with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent — essential safety features for power bank applications.
Manufactured with high‑quality Grade A Li‑Polymer cells and equipped with integrated PCM protection board. The protection features include overcharge protection (detection 4.26±0.05V), over‑discharge protection (detection 2.75±0.1V), overcurrent protection, and short circuit protection. With a cycle life of 500 cycles retaining 80% of original capacity and a service life of over 1000 cycles, these batteries offer exceptional long‑term durability for repeated charging cycles. 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 power banks used in various environments.
Compatibility Note: Fits devices that use 805080 battery model with 2‑wire connection. No connector included — red and black wires only, ready for direct soldering. Please verify your device’s original battery model and connection polarity before ordering (red wire = positive “+”, black wire = negative “-“). Battery dimensions: 8mm thickness × 50mm width × 80mm length — suitable for back clip power banks and standard power bank casings. Suitable for DIY electronic products with power consumption less than 14.8Wh. Not suitable for high‑power power tools or drones.
Installation Tip: If your original battery has a connector (JST PH‑2P or similar), carefully cut and solder the plug from your old battery to these wires using heat shrink insulating sleeves to connect same color wires together (red to red, black to black). Always verify polarity before soldering and do not reverse the connection.
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 5V USB charger with appropriate charging circuit protection when building DIY power banks. 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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