2-Pack 21700 Battery 5000mAh 3.7V | High Capacity Rechargeable Cell
2-Pack 21700 Battery 5000mAh 3.7V | High Capacity Rechargeable Cell
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Short Product Description
Short Product Description
Stop letting low power interrupt your work or play. This 2-pack of high-capacity 21700 5000mAh lithium-ion batteries delivers reliable, long-lasting energy for your most demanding devices. Whether you are powering up a high-lumen tactical flashlight, heavy-duty power tools, or your child’s electric toy car, these rechargeable cells provide the consistent voltage you need to get the job done right.
Key Features
Key Features
- Massive 5000mAh Capacity: Enjoy extended runtimes for high-drain devices, meaning fewer recharges and less downtime during critical tasks.
- Standard 3.7V Output: Provides stable and consistent power delivery, ensuring peak performance for power tools and sensitive electronics alike.
- High Energy Density (18.5Wh): Packs more power into a compact 21700 footprint, acting as a superior upgrade to standard 18650 cells.
- Multi-Device Compatibility: Perfectly sized for heavy-duty flashlights, DIY electronic projects, children's toy cars, and portable consumer electronics.
- Cost-Effective Reusability: Designed for hundreds of safe charge cycles, drastically lowering your long-term battery replacement costs.
Full Product Description
Full Product Description
Unleash Uninterrupted Power for Your High-Drain Devices
Tired of your devices dying mid-task or constantly swapping out weak batteries? The modern tech landscape requires modern power solutions. Our 21700 5000mAh lithium battery is engineered to provide maximum runtime and consistent output, bridging the gap between everyday electronics and professional-grade power requirements.
Why Upgrade to the 21700 Cell?
As the new gold standard for high-performance electronics, the 21700 form factor offers a significant upgrade over traditional 18650 batteries. By utilizing a slightly larger casing (21.1mm x 70.5mm), these batteries pack a massive 5000mAh capacity and 18.5Wh of energy. This means longer continuous operation for your power-hungry devices, reducing downtime and maximizing efficiency.
Built for Reliability and Performance
Whether you are a DIY enthusiast running power tools in the workshop or a parent ensuring your child's electric ride-on car doesn't stall in the park, stability is key. These batteries deliver a steady 3.7V nominal voltage, ensuring your motors run smoothly and your flashlights burn brightly without unexpected power drops.
Safe, Rechargeable, and Eco-Friendly
Invest in a sustainable power solution. These lithium-ion cells are designed for hundreds of recharge cycles, saving you money in the long run while reducing environmental waste. To ensure maximum longevity, simply avoid extreme temperatures and prevent over-discharging—giving you a dependable power source project after project.
Technical Specifications
Technical Specifications
- Battery type: Lithium‑ion (Li‑ion)
- Cell size: 21700
- Quantity: 2 pieces
- Capacity: 5000 mAh
- Nominal voltage: 3.7 V
- Energy rating: 18.5 Wh
- Dimensions: 21.1 mm (diameter) × 70.5 mm (length)
- Weight: Approx. 65.4 g per cell
- Terminal type: Flat top
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
Q1: Can I use this 21700 battery to replace an 18650 battery?
While both are 3.7V lithium-ion cells, a 21700 battery is physically larger (21mm diameter vs 18mm, and 70mm length vs 65mm). It will only fit if your device's battery compartment is explicitly designed to accommodate the larger 21700 form factor.
Q2: How should I store these batteries if I'm not using them for a while?
For long-term storage, keep the batteries in a cool, dry place away from direct sunlight and humidity. It is best to store them at a partial charge (around 40-50%) rather than fully charged or completely empty to preserve the cell's internal chemistry.
Q3: Are these flat-top or button-top batteries?
These are flat-top batteries. Please check your device's manual or battery compartment to ensure it is compatible with flat-top contacts before purchasing.
Target Users / Applications
Target Users / Applications
- DIY & STEM Enthusiasts: Ideal for custom robotics, Arduino/Raspberry Pi power banks, and electronics tinkering.
- Family & Consumer Use: Perfect for bringing high-drain children's electric cars and premium toys back to life.
- Professionals & Tradespeople: Reliable power for heavy-duty cordless tools and long-lasting tactical flashlights for security or engineering work.
