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Mobile chargers up to 7800 mAh

29.01.2013

PNY Technologies has announced the launch of the PowerPack series of mobile chargers. The series includes models with a capacity of 2600, 5200 and 7800 mAh. With the PNY PowerPack, you can extend the battery life of your USB-powered mobile devices. This, in particular, is about smartphones, tablets, e-books and players.

Compact power supplies are enclosed in aluminum cases, equipped with switches and displays showing the charge level. The kit includes a 50 cm cable with micro-USB connectors. You can also connect an Apple cable to the PowerPack to charge your iPhone, iPod or iPad. The battery of the PowerPack itself is also charged from a USB port, which can be a laptop connector, a stationary PC, a charger for a stationary or car power supply.

The 7800 mAh and 5200 mAh PNY Power Pack models have two outputs each, allowing you to charge the batteries of two mobile devices at once. The maximum currents that these outputs can supply to a load are 2,1 and 1 A. The prices of these models are $80 and $60, respectively.

The PNY Power Pack model with a capacity of 2600 mAh has one output, designed for current up to 1 A. The price of this model is $40. The warranty period for any of the three PNY PowerPack models is one year.

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Jaw movement generates electricity 18.09.2014

Canadian scientists have created a "smart" strap that can convert and store mechanical energy from jaw movements (for example, in the process of chewing gum). The accumulated energy in the future can be used to power electronic devices.

To generate electricity, the device uses a polymer material with piezoelectric properties. When stretched and compressed, a potential difference arises in the material, and an electric current appears in the circuit. The strap is attached to the lower jaw with headphones and special devices. When the jaw moves, the strap stretches and contracts, resulting in an electrical current.

According to scientists, only during meals, such a device can develop an average power of up to 7 mW. The researchers found this out during experiments in which they asked participants to chew gum. Experts concluded that the power developed by the strap is too small to power modern electrical appliances. But they are going to eliminate this drawback by increasing the number of layers of piezoelectric material in the strap.

In particular, according to scientists, 20 layers of piezoelectric material with a total thickness of 6 mm will be enough to obtain an output power of 200 microwatts, which is enough to power a hearing aid.

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According to experts, a "smart" strap can be useful for providing electricity to various miniature devices, incl. implants and low-power gadgets. In the future, engineers plan to equip the strap with a special chip that will control the power circuits.

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