Voltage and Amps Differences?

What is the difference in a charger where one is 24V 2.5amp and the other is 12V 5 amp?

Voltage is the force of the push on the electrons. In a light bulb, it will burn brighter at a higher voltage. In an electric motor, it will spin faster at a higher voltage.

Amperes is the flow rate of the electrons. In a battery, Amp hours or milliamp hours is the storage capacity of the cell in potential chemical energy. The higher the capacity or amp-hour rating, the more run time you will achieve. In a rechargeable battery, increased capacity also equates to increased charge times.

Watts, or power (P) is the multiplied elements of volts (V) and amps (I). P = V x I

So 24V, 2.5Ah and 12V, 5Ah, they BOTH produce 60 Watts of power.

The 24 volt will spin faster or burn brighter but for half the time.

The 12 volt will spin slower of burn dimmer but for twice the time.

How Long does a standard AA alkaline battery Last ?

How long does a AA last? I've seen some asking these question and well that really can't be answered by a single time frame and be true.
The truth is that batteries can last for months, even years if they are used in low drain devices such as your wall clock or your TV remote control. However, the same exact battery will last 10 to 20 minutes if you use it on a very high drain device such as a digital camera.

Type of Rechargeables

There are 3 types of Rechargeable batteries out there. Here is a summary of each type:

Nickel-cadmium battery (NiCd):
Used for motorized equipment and other high-discharge devices. NiCd batteries can withstand even more drain than NiMH; however, the mAh rating is not high enough to keep a device running for very long, and the memory effect is far more severe.

Nickel-metal hydride battery (NiMH):
Used for high-tech devices. NiMH batteries can last up to four times longer than alkaline batteries.

Rechargeable alkaline battery:
Uses similar chemistry as non-rechargeable alkaline batteries and are best suited for similar applications. Additionally, they hold their charge for years, unlike NiCd and NiMH batteries.