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2PCS 104050 2500mAh 3.7V Li-Polymer rechargeable batteries with protection board, both batteries front view showing battery labels and red/black wires
104050 battery length measurement, caliper showing 50mm, for speaker hand warmer power bank battery size confirmation
104050 battery width measurement, caliper showing 40mm, ensuring proper fit for device battery compartment
104050 battery thickness measurement, caliper showing 10mm, verifying size compatibility with portable electronics

2PCS 104050 2500mAh 3.7V Li-Polymer Rechargeable Battery for Speaker Hand Warmer Power Bank Heating Suit

Original price was: $13.99.Current price is: $9.99.

🔘 104050 2500mAh 3.7V (2PCS) | 🔋 Li-Polymer with Protection Board | 📱 Compatible with Speaker / Hand Warmer / Power Bank / Heating Suit

8 in stock

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SKU: 2PCS-104050 Category: Tags: , ,
📦 Shipping, Warranty & After-Sales Information (Click to expand ▼)

✅ 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 Period90 days from delivery15-30 days from order confirmation
When It Starts📦 Upon delivery⚠️ Upon order confirmation (even before you receive it)
Claims HandlingWe do it directly — email usAutomated dispute system, seller dependent
After Window ExpiresStill can contact us for supportNo 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 and may be affected by customs, weather, or other unforeseen circumstances. If your country is not listed in the table below, we are currently unable to ship batteries to that destination.

DestinationFreight (USD)Est. Delivery Time
United States$7.808–15 days
Canada$6.8018–30 days
Mexico$10.0030–60 days
Germany, France, United Kingdom, Greece$6.5018–30 days
Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Hungary, Ireland, Italy, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland$8.0018–30 days
Croatia, Finland, Lithuania, Latvia, Slovenia$8.0030–50 days
Bulgaria, Romania$14.0030–50 days
South Korea, Japan, Australia, New Zealand, Israel, Malaysia, Singapore, Thailand, Philippines, Kazakhstan$7.5018–30 days
United Arab Emirates, Saudi Arabia, Vietnam, Chile, Peru, Colombia, Brazil$18.0025–60 days

🇧🇷 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.

🇪🇺 Note for EU countries: Due to new EU customs regulations effective July 1, 2026, a flat tariff fee of $4.00 (approx. €3.50) applies to shipments to EU countries. This fee covers customs tariff, handling, and payment processing costs, and will be added at checkout. Thank you for your understanding.

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Description

✅ 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.

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.

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Frequently Asked Questions

The 104050 battery for speaker and hand warmer works with many 3.7V portable electronic devices. Compatible devices include Bluetooth speakers, electric hand warmers, power banks (DIY power bank kits), heating suits (heated jackets, heated gloves), portable fans, LED lights, small medical devices, electronic toys, and various DIY 3.7V electronic projects. Before ordering, please check your original battery model is 104050 or measure your battery compartment — it should be approximately 10mm thick, 40mm wide, and 50mm long. This 2500mAh rechargeable Li-Polymer battery with protection board is not suitable for high‑power devices like power tools, drones, or model aircraft.

The 104050 2500mAh 3.7V Li-Polymer battery has a typical capacity of 2500mAh (9.25Wh) and nominal voltage of 3.7V. Charge limit voltage is 4.26V, discharge cut‑off voltage is 2.75V. Battery dimensions are 10 x 40 x 50mm. Standard charge and discharge current is 0.5C (1250mA). Operating temperature range: charge 0‑45°C, discharge ‑20 to 60°C. The battery features built‑in PCM protection board with 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. Cycle life is 500 cycles maintaining 80% of original capacity. Connection: red wire positive (+), black wire negative (‑).

Installing 104050 battery in speaker or hand warmer is straightforward. First, turn off and disconnect your device from power. Open the battery compartment or disassemble the device to access the old battery, carefully noting the connection polarity — red wire positive (+), black wire negative (-). Disconnect the old battery. If your original battery has a connector (such as JST PH‑2P), you have two options: Option 1: Desolder or cut the old battery wires and solder the new 104050 battery wires following the same polarity, using heat shrink tubing for insulation. Option 2: Cut the connector from the old battery (keep at least 5cm of wire attached) and solder it to the new battery wires — red to red, black to black — then insulate with heat shrink. Never reverse the polarity as this can damage the device or battery. After installation, reassemble the device and charge fully before first use. If you are not comfortable with soldering, professional installation is recommended.

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