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The Best Rechargeable Batteries and Chargers Of 2017

by Justin Thomas •

In A Nutshell Here are my recommendations for the best rechargeable AA batteries: If you want the best energy capacity (2500 mAh) — get the Eneloop Pro If you want maximum recharge capacity (2100 times) — get the 4th Generation Panasonic Eneloops (800 mAh) If you want to save some money and don’t mind a little less performance from your …

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The Best C-Size Rechargeable Batteries

by Justin Thomas •

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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The Best D-Size Rechargeable Batteries Of 2017

by Justin Thomas •

Maha PowerEx Rechargeable D Batteries

There are now a number of low-discharge D-size cells available. These cells are as powerful as powerful alkaline batteries, and they hold 85% of their charge for a year. The highest-capacity D-size rechargeable cells are rated at 11000-12000 mAh (milliamp hours). Here are our recommendations: The Highest Capacity D-Size Batteries: Powerex The Powerex batteries pictured above are rated at 11,000 …

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The Best Battery Chargers (For D and C Size Batteries)

by Justin Thomas •

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

by Justin Thomas •

Sanyo XX "Powered By Eneloop"

Update: This article is out-of-date, please see my 2015 review.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.

The Spun Chair: A Sculpture That Rotates You

by Justin Thomas •

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 …

10

The Highest Capacity Rechargeable AA Batteries

by Justin Thomas •

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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Do Rechargeable Lithium-Ion AA Batteries Exist?

by Justin Thomas •

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 LED Desk Lamps

by Justin Thomas •

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. …

Efficient Men’s Shirt For Summer: Renewable Wool, Non-Wrinkling, Made In USA

by Justin Thomas •

Ibex makes shirts from renewable merino wool (from New Zealand). Ibex clothing is sewn in the USA (only tiny faction of the shirts sold in the US are actually constructed here). I like merino wool because it keeps you cool in the summer, and unlike cotton or synthetics, merino does not retain odor, and it does not wrinkle. The polo …