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2 years ago

What Is A Portable Battery Charger?

The term battery charger relates to a number of devices used to induce energy into a rechargeable battery to replenish its power portable battery charger supply capabilities. These days we use battery chargers for many applications, and a lot of our mobile devices and digital appliances such as cameras have rechargeable batteries that need regular topping up to ensure the device remains functional.

The amount of charging that a device requires depends on the type and rating of batteries in use with the device. Some devices can withstand a constant sustained charging source and are not damaged or impaired should that charging source remain in place even after the batteries have been fully charged. Other devices will cut off the current to the batteries once they reach full charge. Some chargers employ a trickle charge, supplying only a small amount of current that can take several hours to charge a battery, whilst others can charge batteries in under an hour.

There are many different types of battery chargers available which employ many different methods, and we will only mention one or two as we concentrate on chargers employed for mobile phones, Smartphones, iPhones, iPods and iPads, which we often refer to as a portable battery charger.

One type of charger of note is the induction charger which uses a form of electromagnetic induction by transmitting electrical energy by means of some form of inductive coupling. For quite a number of years now they have been designed for use in environments where normal chargers may represent a risk of electrocution, such as bathrooms and other areas where the user may come into contact with water. Electric toothbrushes are a good example of objects that may use an induction charger. Powermat provide a range of induction mats designed to wirelessly charge a selection of smartphones, including the iPhone range.



Probably the biggest use for battery chargers is in the mobile phone market, and in recent years standards were developed for charging mobile devices using USB connections. The microUSB connector was developed specifically to connect a USB cable to a mobile device such as a phone or a digital camera. Voltages on USB connections are designed at or around 5 Volts with a maximum of 5.25 Volts, so they are ideal in most situations due to the low voltages involved. Since 2009 most of the major mobile phone vendors agreed to standardize the use of Micro-USB as the interface on mobile phones for the purpose of charging the batteries.

A popular type of charger is the in car battery charger for use with devices such as mobile phones, MP3 players and SatNav models. They receive their power via a connection with a car cigarette lighter and have an input range of somewhere between 12 and 24 Volts and output 5 Volts at 1 Amp current. Some of these chargers even come with a selection of connector tips to make them compatible with a range of popular mobile devices. A good example of a universal car charger is the Belkin F8Z689CW which is designed to charge your Apple device such as iPad, iPhone or iPod whilst on the move. This compact device sits neatly in your dashboard and connects to your cigarette lighter, providing a 3 foot cable for connection to your mobile device.

There are a wide variety of mobile battery chargers and adapters currently on the market specifically designed for use with mobile devices, and it really just depends on the model that suits your needs. I would certainly recommend buying a model from a well known manufacturer, particularly as a lot of cheaper copies have flooded the market in recent months, some of which have been found to be faulty, and in some cases dangerous.

About external battery pack the Author:

This article on mobile battery chargers was written by David Christie, MD at NSTUK Ltd, Website http://www.ipexpress.co.uk/Chargers-Power/b/1569153031

2 years ago

Battery Charging Methods

During charging, the chemical action takes place which is exactly opposite to that of discharging. Thus current in opposite direction at the time of discharge, is passed through the battery. For this the voltage applied is in excess of the voltage of the battery or cell. The battery voltage acts in opposite direction to that of the applied voltage and hence called back e.m.f.

Indications of Fully Charged Battery

The various indications of the fully charged cells are,

1. Specific gravity: The specific gravity of the fully charged cell increases up to 1.28 from about 1.18.

2. Gassing: When the cell is fully charged, it starts liberating the gas freely. In lead acid battery the hydrogen is liberated at cathode while oxygen at the anode. Gassing is a good usb extension cable indication of fully charged battery. Some acid particles may go out with the gases hence the charging room must be kept well ventilated.

3. Voltage: The voltage of the fully charged cell is about 2.7 V.

4. Colour: The colour of the plates changes for fully charged cell. Colour of the positive plate changes to dark chocolate brown while that of negative plate changes to grey colour. But as plates are immersed in the electrolyte, this indication is not clearly visible.



Charging Methods:

usb extension cable is used and later on lower charging rate is preferred.

Constant Voltage Method

In this method, the constant voltage is applied across usb extension cable the cells, connecting them in parallel. The charging current varies according to the state of the charge of each battery. The batteries to be charged are connected in 6 or 12 volt units across the positive and negative bus bars i.e. mains supply. When the battery is first connected, a high charging current flows but as the terminal voltage of the battery increases, the charging current reduces automatically. At the end of the full charge, the voltage of the battery is equal to the voltage of the bus bars and no current flows. The charging time required is much less in this method.

Rectifier Method

When battery is required to be charged from a.c. supply, the rectifier method is used. The rectifier converts a.c. supply to a.c. Generally bridge rectifier is used for this purpose. The step down transformer lowers the a.c. supply voltage as per the requirement. The bridge rectifier converts this low a.c. voltage to D.C. this is used to charge the battery.

2 years ago

Portable charger of 150,000mAh? | Yahoo Answers

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