It will not make a difference if it has power or not. It will probably take four to six hours to charge to full power and energy even if you still have the battery intact. There is a massive difference in how long it will go. When you are not using it most cell phones have a standby mode which can be utilized. But if you constantly use the battery it will deteriorate much faster.

Most of the latest batteries are fitted with Lithium – Ion. They don’t suffer from memory malfunction or memory effect like the Nickel Hydride batteries. This might happen when you will charge the battery when it was only half down, and after some time we come to know that half down was empty. Lithium Ion batteries should be charged for at least 10 – 12 hours before using it.

Most of the cell phones are now fixed with lithium ion batteries and charging should not be a matter of question but one thing should be kept in mind that do not charge the batteries for over 24 hours.

Mobile phone chargers as well as added AC/DC power circuit generally use less amount of power even if the cell phone it gives power is not switched on or plugged in. Limited amount of watts is consumed but if you leave your charger switched on or plugged in all the time that power is being utilized all day long. Over the time it is accumulated and if you multiply that usage by all the other power circuits you may have switched on or plugged in can be very important.

Any electronic device which has a remote control is consuming power and energy even when it is switched off or unplugged. An excellent answer is to plug in the devices in to a power band. Then you can switch off the power band to decrease the power consumption.

I will suggest that you should purchase Lithium Ion battery instead of Nickel Hydride. The charge current will be determined by the know-how and capacity of the battery being charged. The current that will be applied to charge a 15V car battery will be entirely different to the current that will be utilized for a mobile phone battery.

Battery chargers for cell phone batteries are obvious in that they are available in a large selection of connector styles and voltages; most of them are not well-matched with other manufactures’ cell phones or even diverse models of cell phones from one manufacturer.