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This device plugs into a USB port to charge its battery. It can also be used to charge or power other devices via USB. Battery operated hand warmers use electrically resistive heating devices to convert electrical energy in the battery into heat. Typically hand warmers can heat for up to six hours, with heat outputs from 40-48C.
Most heaters contain a battery-operated or piezo-electric ignitor to light the heater without the need for matches. If the ignitor should fail the heater can still be lit manually. The Japanese non-vented "fan" heater burns kerosene gas and is known as a gasification type heater.
The battery version commonly used tubes where the filament was heated by a single 1.5-volt dry cell and plate voltage was supplied by a (nominally) 90-volt battery. One version, called a Three-way portable because it could be operated any of three ways: batteries, the AC line, or the DC line; typically had the following tube array:
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The 7.4-volt battery is the most common type of heated clothing battery system, and may be rechargeable. The most popular items sold have traditionally been heated gloves and jackets. 12-volt batteries are designed for use with motorcycles, ATVs, or snowmobiles, and draw their power from the vehicle's battery.
A storage heater or heat bank (Australia) is an electrical heater which stores thermal energy during the evening, or at night when electricity is available at lower cost, and releases the heat during the day as required. Accumulators, like a hot water storage tank, are another type of storage heater but specifically store hot water for later use.
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