TOP PICKS
Bestseller No. 1
BFHB 21700 Battery Case Set 5000 mAh for Flashlight - 2 Pack
- Precision Design - Tailored for flashlights, these batteries set are seamlessly integrated with their corresponding battery cases, offering a safe and efficient power solution to keep devices operating optimally when needed.
- Wide Compatibility - With the standard size, these batteries are compatible with many flashlight brands and other electronic devices, including LED torches, portable devices, headlights, toys, cameras and other household appliances. Providing users with a broader range of choices and flexibility.
- Reliability and Durability - High-quality manufacturing processes and materials ensure the stability and durability of it, allowing them to perform exceptionally well in various environments and usage conditions.
- Ensuring reliable power for extended durations, making it an ideal choice for various devices.
- Enjoy our warm after-sales service: If you encounter any issues, don't hesitate to reach out to us. We're committed to resolving them for you promptly.
Bestseller No. 2
CPZZ 21700 Battery 5000mah 3.7volt 21700 Rechargeable Battery for flashlights,(4pack-0520)
- Widely Compatible: 3.7 volt 21700 Rechargeable battery for flashlights, headlights, this 3.7v battery is highly portable, making it convenient for travel, camping trips.
- Product Size: 21*21*70 mm (0.82*0.82*2.75 inches),it's a 3.7 volt rechargeable battery, please check carefully before purchasing !!!).Please confirm whether the battery model required by your device.
- High performance product: 21700 battery With a capacity of 5000mAh and voltage of 3.7v battery, high capacity battery with low discharge rate, high power consumption, high energy density and pollution-free design, No need to change batteries frequently.
- Multiple Protections:This 3.7v Rechargeable battery features six types of protection, including temperature, short circuit, overcharge, and overcurrent protection. These features ensure the battery remains stable and your device stays protected at all times.Please fully charge the battery before the first use, the battery will work better. Charge up to 1000 times without frequent battery changes.
- High-quality service: Every product is inspected before shipping! If you encounter any problems during the purchase process, please feel free to contact us.
Bestseller No. 3
CWUU 5000mAh 21700 Rechargeable Battery, 3.7V Battery for Flashlights, Headlamps & More (2 PACK)
- 💡Attention: 70*21*21mm(2.75*0.82*0.82 inches). Prior to purchasing, ensure to meticulously verify the dimensions to guarantee compatibility.
- 💡Storage Guidelines: To maintain optimal battery lifespan and performance, store the battery away from high temperatures, humidity, and direct sunlight for prolonged periods.
- 💡Safe Charging Practices: Utilize chargers that match the appropriate voltage and current specifications to prevent overheating, overcharging, or potential hazards during charging.
- 💡Reliable Safety: Crafted with premium materials and employing advanced manufacturing techniques, our battery ensures top-notch safety performance, mitigating risks such as overcharging, over-discharging, and short circuits.
- 💡Customer Support: We take pride in our efficient and responsive customer service. Should you have any inquiries, feel free to reach out to us, and we'll be at your service 24/7, ready to assist you.
Bestseller No. 4
CBJJ 21700 Rechargeable Battery, 3.7 Volt 21700 Battery 5000mAh Flat Top 21700 Li-ion Battery for Flashlight (2 Pack, Black)
- High Capacity: 5000mAh rechargeable battery provides stable power for devices and prevents damage from high frequency use
- Safety Features: Flat top battery has no memory effect and provides multiple protections against short circuit, overcharge, and overcurrent
- Compatibility: 3.7V lithium ion battery is compatible with flashlights, headlamps, and other devices
- Portable Design: Lightweight and compact battery is convenient for home and outdoor use
- Warranty and Support: CBJJ products undergo strict testing and come with a 30 day money back guarantee and fast email support
Bestseller No. 5
EcoSolutions 21700 Rechargeable Battery Case Set, 5000mah Large Capacity 3.7Volt 21700 Tip Battery for flashlights ect, 2pack
- Widely Compatible: 5000mAh 21700 Rechargeable battery large capacity,Which can be widely used for electronic devices, such as LED flashlights, emergency lights, portable devices, headlights, toys, remote controls, etc.
- Reliability and Durability: High-quality manufacturing processes and materials ensure the stability and durability of it, allowing them to perform exceptionally well in various environments and usage conditions.
- Product Size: 21*21*70 mm (0.82*0.82*2.75 inches),it's a 3.6 volt rechargeable battery, please check carefully before purchasing !).Please confirm whether the battery model required by your device.
- Large capacity: 21700 battery With a capacity of 5000mAh and voltage of 3.6v battery, high capacity battery with low discharge rate, high power consumption, high energy density and pollution-free design, No need to change batteries frequently.
- Enjoy our warm after-sales service: If you encounter any issues, don't hesitate to reach out to us. We're committed to resolving them for you promptly.
Bestseller No. 6
CPZZ 21700 Rechargeable Battery 5000mAh Battery Large Capacity 21700 3.7v Batteries for flashlights,doorbells (8Pack 3.7v battery 0310LQY)
- 【3.7v battery Dimension】3.7v rechargeable battery Type: 21*21*70 mm (0.82*0.82*2.75 inches). NOTE: Please confirm the battery size and battery type before purchase. Please confirm whether the battery model required by your device is 21700.
- 【Large capacity】 This 3.7 volt rechargeable battery is with 6800mAh large capacity, supporting stable power for your devices and effectively prevent damage of the devices, the battery can provide you with a long usage time.
- 【widely compatible】These rechargeable 21700 3.7v rechargeable battery are widely used in various devices, including flashlights, headlamps,doorbells and more. Portable & lightweight items for home use and outdoor use. NOTE: Please fully charge the products before use.
- 【Product Features】These 21700 batteries are rechargeable, Designed with multiple protections, such as overcharging, over-discharging and short circuit protection, ensuring safe and reliable use. Easy to use, High quality , durable,Charge up to 800 cycles,No need to change batteries frequently.
- 【Warm After-sales Service】All of products have passed strict testing for normal use. If you have any question, please feel free to contact us, We will do our best to resolve any problems.
Bestseller No. 7
CWUU 21700 Rechargeable Battery 3.7V 5000mah High Capacity for Flashlight 240412(2 Pack)
- Size: 70mm x 21mmx 21mm(2.75*0.82*0.82 inches) ; Battery must be FULLY charged before first use.
- Important NOTE - This is 21700 rechargeable battery lithium 3.7 volt. NOT AA Battery or AAA Battery. Please confirm whether the battery model required by your device is 21700.
- Versatile Battery - 3.7 volt rechargeable battery 21700 is versatile and can be used for a variety of electronic devices, including LED torches, portable devices, headlights, toys, cameras and other household appliances.
- Environmentally Friendly - 21700 3.7V battery supports multiple charging and discharging cycles without memory effect. Designed with multiple protection functions, such as over-charging, over-discharging and short-circuit protection, to ensure safe and reliable use.
- Warm After-sales Service: If you have any problems, please feel free to contact us. We will solve the problem for you ASAP.
BUYING GUIDE
Choosing the best 21700 batteries requires a clear understanding of your specific needs, the devices you’ll use them in, and the features that matter most in a battery. Here’s a detailed guide to assist you in making an informed decision:
1. Capacity:
One of the first things to consider when buying a 21700 battery is its capacity, which is measured in milliampere-hours (mAh). A higher capacity means the battery can store more energy, providing longer use between charges. Consider your device’s energy demands and how often you’re able to recharge when determining the necessary capacity.
2. Continuous Discharge Rating (CDR):
The CDR indicates how much current a battery can safely provide without overheating. This aspect is crucial for high-drain devices like vapes or power tools. Ensure the battery’s CDR meets or exceeds your device’s requirements.
3. Quality and Brand Reputation:
Always opt for batteries from reputable manufacturers. Renowned brands are more likely to adhere to safety standards and offer consistent battery quality. Though they may come at a higher price, they provide reliability and peace of mind.
4. Protected vs. Unprotected:
Protected batteries have an integrated circuit (IC) that guards against overcharge, over-discharge, and short-circuiting. These are safer and more suitable for general use. Unprotected batteries, while capable of delivering high current, require a more cautious handling and are better suited for experienced users with specific needs.
5. Device Compatibility:
Make sure the 21700 battery is compatible with your device. Even though the name suggests specific dimensions, there can be slight variations in size that might affect the fit, especially for protected batteries that tend to be longer due to the added circuit.
6. Rechargeable:
Most 21700 batteries are rechargeable, but it’s still an important feature to confirm. Rechargeable batteries are more cost-effective and eco-friendly in the long run.
7. Shelf Life and Durability:
Look into how long the battery retains charge while not in use and its overall lifespan. Quality batteries have a longer shelf life and can endure more charge cycles before their capacity significantly degrades.
8. Safety Features:
Aside from protection circuits, other safety features to consider include a stable chemical composition and robust casing materials to prevent leakage and withstand high temperatures.
9. Reviews and Recommendations:
Consult recent user reviews and recommendations. They can provide insights into real-world performance and potential issues not covered in the product specifications.
10. Price:
While you shouldn’t skimp on quality, compare prices among various reputable options. Higher cost doesn’t always equate to a better product, but avoid suspiciously cheap batteries, as they might compromise on quality and safety.
11. Environmental Impact:
Consider the environmental friendliness of the battery brand, such as the manufacturer’s practices regarding sustainability and whether they offer a recycling program.
12. Regulatory Compliance:
Check if the battery complies with relevant standards and regulations, confirming its quality and safety.
Investing in the right 21700 battery involves balancing performance, reliability, safety, and cost. Always follow the manufacturer’s guidelines for usage, storage, and charging to ensure safety and prolong battery life.
