There are now a number of low-discharge D-size cells available. These cells are as powerful alkaline batteries, and they hold 85% of their charge for a year. The highest-capacity D-size rechargeable cells are rated from 10000 to 12000 mAh (milliamp hours). Here are our recommendations: The Highest Capacity D-Size Batteries: Powerex The Powerex D-Sized Batteries are rated at 10,000 mAh. …
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The Highest Capacity Rechargeable AA Batteries
For powering high-drain electronics such as digital cameras, the most efficient batteries to use are high-capacity Nickel Metal Hydride (NiMH) cells. Higher capacity batteries store more charge and they can power your devices longer. The highest capacity rechargeable AA batteries are: Ansmann’s 2850 mAh batteries and Powerex’s 2700 mAh batteries. Of these two batteries, Powerex’s 2700 mAh gets the most positive reviews from photographers. It received …
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The Best C-Size Rechargeable Batteries
The best rechargeable C-size batteries are Acculoop C cells, by Accupower. These batteries are the new low self-discharge NiMH (Nickel Metal-Hydride) cells, and they have a high capacity of 4500 mAhs (milliamp hours).
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Do Rechargeable Lithium-Ion AA Batteries Exist?
Do rechargeable lithium-ion batteries exist in standard sizes like AA, AAA, C or D? Yes, they are finally available. A company called Kentli has released AA and AAA rechargeable lithium polymer batteries that output 1.5 volts. Kentli batteries are available on Amazon here. Lithium-ion batteries normally operate 3.7V per cell — but Kentli put circuitry inside the cells to reduce the voltage …
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The Best Battery Chargers (For D and C Size Batteries)
We briefly reviewed battery chargers in a previous post “The Best Rechargeable AA Batteries“. But let’s take a look at the best “Universal Battery Chargers”. These are chargers that can handle AAA, AA, C, D sized cells, and well as 9V cells.
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The Longest Lasting Rechargeable AA Batteries
Update: This article is out-of-date, please see my 2015 review. Sanyo’s Eneloop batteries have had an edge over other rechargeable AAs since they were released in 2005. Basically, Eneloops could retain their charge longer than other rechargeables, including other low self-discharge AAs. Eneloops can hold 85% of their charge for one year, and 75% after three years.
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Best Commuter Bikes
Bike manufacturers have answered the call to the increased population of bike commuters by designing full lines of commuter specific bikes. Though many of these commuter bikes aren’t cheap, if you’re giving up the car in favor of the most efficient form of transportation, you will of course save money. It is recommended that if you only have it in …
The Spun Chair: A Sculpture That Rotates You
Our first entry into the MetaEfficient gallery is the Spun Chair by Heatherwick Studio. Is it an oversized toy? Is it a sculpture? Is it a piece of furniture? All three perhaps. I first spotted the Spun Chair while at the Hammer Museum in Los Angeles. Everyone who took the chair for a spin seemed to be delighted. The chair gives …
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The Longest Mountain Bike Trail In The World
It could be said that the Great Divide Bike Trail is like the Mount Everest of cycling adventures. Not only is it the longest mountain bike trail in the world at 2,500 miles, but it has over 200,000 feet of elevation gain. Stretching from Canada to Mexico, the Great Divide bike trail travels through some of the most mountainous regions …
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The Best LED Desk Lamps
Best Overall: TaoTronics Elune Desk Lamp The TaoTronics Elune is priced at $50 and it is probably the best value LED desk lamp available. This lamp has 30 LEDs that shine with 450 lumens at full power. The lamp has a slide touch switch on the top that allows you to adjust the brightness to any one of 7 brightness levels. …
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