MetaEfficient
External hard drives allow you to add terabytes of storage to your computer for a few hundred dollars. External drives connect to PCs and Macs via their external connectors. Almost every computer has a USB 2.0 port, so it’s the most common type of connection currently. Here’s the speed of other interfaces (from slowest to fastest): FireWire 400, [...]
Today, we use smartphones and tablet computers wherever we go. However, batteries life tends to be a constant issue. That’s why carrying a spare charger in your daypack or purse makes a lot of sense. In most cases, you just need a bit of spare power to make a call or access the internet.
The small size and directional light output of LEDs make them ideal for personal reading lights, and they are energy efficient too. Here are some of the best LED reading lamps:
This year, we found that Onkyo and Harmon Kardon are the brands that produced the best budget stereo amplifiers. Above the $500 level, your best bet is a amplifier like the Marantz PM6004 Integrated Amplifier. It received What Hi-Fi’s Product Of the Year in 2011.
See also our master [...]
LED Lanterns are perhaps the most useful portable lights — they can be used as camp lights, work lights, or emergency lights. The LEDs inside aren’t susceptible to shocks, and they burn for decades.
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).
NiZn (Nickel-Zinc) batteries are a type of rechargeable AA battery that operates with a nominal voltage 1.6 volts, which is very close to the 1.5 volts of alkaline batteries. This makes NiZn battery perform well in high-drain devices like handheld games.
Low-self discharge 9v NiMH batteries have recently become available from Tenergy and Maha. Low-self discharge means these batteries will hold their charge for a year, unlike previous NiMH batteries.
Centura 9V NiMH Battery by Tenergy
You can find the low-discharge, 200 mAh “Centura” Tenergy 9V [...]
Do rechargeable lithium-ion batteries exists in standard sizes like AA, AAA, C or D?
No, they don’t. According to Isidor Buchmann, author of Batteries in a Portable World: A Handbook on Rechargeable Batteries for Non-Engineers, this is due to safety concerns — people might try to charge them in chargers made for [...]
A company called G7 has released a 900 lumen LED light bulb, which is selling for around $19. This warm white ( 3,000K) bulb runs on just 9W, and it is equivalent to a 65 watt incandescent bulb. It has a 75+ Color Rendering Index (CRI) — quality household lights tend to [...]
"The Best Flash Drives Of 2012 (http://t.co/Mug2Uj22)— metaefficient
