Q. What does a battery do?

Essentially a battery stores chemicals that produce electrons. When the chemicals interact they produce an Electro-chemical reaction that results in the free flow of electrons. This free flow of electrons is the energy produced that supplies power to the device.

Q. What is a battery?

Technically, a battery consists of two or more cells connected in series or parallel. Frequently, however, a single cell as a battery and two or more cells connected together as a battery pack since the average consumer thinks that way.

Q. How are batteries rated?

Batteries are rated in terms of Voltage and Amp Hours (amp hours is sometimes broken down to mille-amp hours mAH which is one thousandths of amp hour -1 amp hour is 1000 mAHs).

• Voltage is a unit of measuring electrical pressure; all batteries are rated in volts DC (direct current). The higher the voltage the more power the battery can deliver.
• Amp Hour is the quantity of electricity measured in ampere-hours (Ah) that may be delivered by a cell or battery under specified conditions. The higher the amp hour the longer the battery will deliver electricity.

Q. What is a battery Pack?

Since a single cell is considered a battery, a battery pack is considered to be 2 or more cells connected in series or parallel.

• Types of battery connections

– Series

-Parallell

Type of battery pack connections:

• Series: The interconnection of cells in such a manner that the positive terminal of the first is connected to the negative terminal of the second, and so on, resulting in increased voltage

Series Example

• Parallel: Term used to describe the interconnection of cells or batteries in which all the like terminals are connected together. Results in increased capacity.

Parallel Example

Q. How long will my battery or battery pack last until it needs to be replaced or recharged?

The amount of time a battery will last depends on the capacity of the battery (AH) and the amount of amps needed to operate the device using the battery. There are two ways of conveying how long a battery will last.

Example 1:

If all you know is the capacity (AH) of the battery then you can conclude the following: A 1AH battery will give on hour of run time at a 1-amp draw. Likewise, that same 1 AH battery will give 2 hours of run time at a 1/2 amp draw and 1/2 hour run time at a 2-amp hour draw.

Example 2:

If you know both the capacity of the battery and the draw of the device you can then determine exactly how long the battery will last or determine how much capacity a device will need to run for a certain amount of time.  If the device is drawing 2 amps and the battery being used is 3a amps, the amount of run time will be 1 1/2 hours (amp hour of battery divided by amps being drawn by device, 3 divided by 2 = 1.5 hours).

To determine the capacity of a battery needed simply take the amount of amps being drawn by the device and multiply it by the number of hours of run time needed. If you are drawing 10 amps and need to get 4 hours of use constant use then the capacity of the battery that you will need is a 40-amp hour battery.

Amp Hour of battery                                         Amps of Draw                               Run time of battery

1                                                                                    1                                                               1 hour

1                                                                                    1/2                                                            2 hours

1                                                                                    2                                                                1/2 hours

5                                                                                    1/2                                                            10 hours

5                                                                                    20                                                              15 minutes

7                                                                                     25                                                              16.8 minutes