What's more frustrating than a dead cell phone battery is not even having a cell phone charger to charge the battery. Here is a simple way to make your own cell phone charger. more »
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What's more frustrating than a dead cell phone battery is not even having a cell phone charger to charge the battery. Here is a simple way to make your own cell phone charger. more »
Greenhouse gas emissions are the byproducts of all our energy-consuming activities. The pollution from power plants is due to humans not making the best environmental choices. People must know where they are leaving harmful emissions in their wake and how to correct that. By making a few simple changes, like driving less when possible... more »
Mechanical wind-up power produces such little electricity that it can only be put to use in a handful of cases. Recharging notebook computers is one of the few tasks that requires such little power that a crank generator can adequately meet the power requirement. The smaller and more efficient the laptop, the easier it will be to... more »
Are you planning a European vacation or trip to some other fabulous international vacation spot? If so, you will want to have a cell phone that works internationally. Will you be able to use your own cell phone internationally? more »
Cell phones are usable in most places, but unfortunately chargers are not. If you frequently travel outside the range of a wall outlet or car jack, you know that cell phone battery life is never long enough. Fortunately, it is relatively easy to make a homemade cell phone charger. This small, portable device will allow you to use AA... more »
Recycling your cell phone charger is a simple task. People throw millions of cell phones and chargers away each year to end up in landfills and... more »
With laptop computers and cell phones, anyplace can be an office. A power inverter or power adapter can turn a car into a mobile office, making... more »
A computer isn't much fun without all of the accessories that go with it. They can be expensive, and you want them to last as long as possible.... more »
Modern phones like the T-Mobile Wing have the capability to be used as a wireless modem to connect other computers nearby to the Internet, just... more »
A battery charger is a device used to put energy into a secondary cell or (rechargeable) battery by forcing an electric current through it.
The charge current depends upon the technology and capacity of the battery being charged. For example, the current that should be applied to recharge a 12 V car battery will be very different from the current for a mobile phone battery.
Types of battery chargers
Simple
A simple charger works by supplying a constant DC power source to a battery being charged. The simple charger does not alter its output based on time or the charge on the battery. This simplicity means that a simple charger is inexpensive, but there is a tradeoff in quality. Typically, a simple charger takes longer to charge a battery to prevent severe over-charging. Even so, a battery left in a simple charger for too long will be weakened or destroyed due to over-charging. These chargers can supply either a constant voltage or a constant current to the battery.
Trickle
A trickle charger is a kind of simple charger that charges the battery slowly, at the self-discharge rate.
A trickle charger is the slowest kind of battery charger.
A battery can be left in a trickle charger indefinitely.
Leaving a battery in a trickle charger keeps the battery "topped up" but never over-charges.
Timer-based
The output of a timer charger is terminated after a pre-determined time. Timer chargers were the most common type for high-capacity Ni-Cd cells in the late 1990s for example (low-capacity consumer Ni-Cd cells were typically charged with a simple charger).
Often a timer charger and set of batteries could be bought as a bundle and the charger time was set to suit those batteries. If batteries of lower capacity were charged then they would be overcharged, and if batteries of higher capacity were charged they would be only partly charged. With the trend for battery technology to increase capacity year on year, an old read more at » http://en.wikipedia.org/wiki/Battery+charger
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