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2. Our editors' favorite personal fans to keep you cool

   www.aol.com/editors-favorite-personal-fans-keep...

   Bladeless Neck Fan, 5000mAh Rechargeable Battery Powered, 3 Speeds, Angle Adjustable, Hand-free Portable Neck Fan for Both Outdoor & Indoor Use, UL Certified, Black (AMAZON)

3. Editors Say These Neck Fans Kept Them Cool During the Hottest ...

   www.aol.com/8-best-wearable-air-conditioners...

   Battery Life Most models on this list will last an average of 8-12 hours on a single charge, depending on which fan speed you choose. Those figures are according to each manufacturer's claims.

4. These Tried-and-Tested Neck Fans Will Keep You Cool All Summer

   www.aol.com/lifestyle/tried-tested-neck-fans...

   The built-in 4,000mAh rechargeable battery is claimed to max out at 16 hours on the lowest settings. ... Battery life is where this neck fan suffers. The company claims a maximum of nine hours on ...

5. Energy Conservation Program for Consumer Products - Wikipedia

   en.wikipedia.org/wiki/Energy_Conservation...

   The Energy Conservation Program for Consumer Products Other Than Automobiles (42 U.S.C. §§ 6291–6309) is a regulatory program that enforces minimum energy conservation standards for appliances and equipment in the United States. [1]

6. Charge cycle - Wikipedia

   en.wikipedia.org/wiki/Charge_cycle

   Each battery is affected differently by charge cycles. [2] [3] In general, number of cycles for a rechargeable battery (the cycle life) indicates how many times it can undergo the process of complete charging and discharging until failure or starting to lose capacity. [4] [5] [6] [7]

7. Energy density Extended Reference Table - Wikipedia

   en.wikipedia.org/wiki/Energy_density_Extended...

   battery, Lithium–Manganese [19] [20] 0.83-1.01: 1.98-2.09: battery, Sodium–Sulfur: 0.72 [21] 1.23 [citation needed] 85% [22] battery, Lithium-ion [23] [24] 0.46-0.72: 0.83-3.6 [25] 95% [26] battery, Sodium–Nickel Chloride, High Temperature: 0.56: battery, Zinc–manganese (alkaline), long life design [19] [23] 0.4-0.59: 1.15-1.43: battery ...

8. These Editor-Recommended Neck Fans Keep You Cool on the Go

   www.aol.com/lifestyle/throw-air-conditioner...

   Delmac’s neck fan needs only three hours of charging to last up to an estimated 20 hours. The bladeless design has 60 air holes that wrap around the band to circulate air around your neck and face.

9. Nickel–zinc battery - Wikipedia

   en.wikipedia.org/wiki/Nickel–zinc_battery

   Nickel–zinc batteries have a charge–discharge curve similar to 1.2 V NiCd or NiMH cells, but with a higher 1.6 V nominal voltage. [5]Nickel–zinc batteries perform well in high-drain applications, and may have the potential to replace lead–acid batteries because of their higher energy-to-mass ratio and higher power-to-mass ratio – as little as 25% of the mass for the same power. [6]