Most battery life spans are rated based on mAh (milliamp hours). Certain brands, such as Sony, use different protocols to rate the predicted life time of their batteries. In some cases, no life span is rated at all. In such cases, mathematical equations can be used to convert between the various electrical components -- such as current, resistance and voltage -- to come up with the actual lifespan of the battery. Most batteries will print some combination of the voltage, amperage, and wattage of the battery.
Digital cameras normally come with a built in Li-ion or Lithium ion battery similar to the one found in mobile phones, laptops, PDAs and iPods. This is the popular square flat type that requires recharging for continuous use. The gadget itself comes with a charger upon purchase and all you need is to connect the cord to the camera and then plug it into an electrical outlet to start the battery charging process.
Each digital camera battery has a rating and this is known as a mAh or Milliamp Hour. The mAh refers to the power a certain battery is capable of holding which means that a battery with higher mAh values should last longer without having the need to recharge it.
If you don't wish to use the AA alkaline digital camera batteries, what you can do is buy another battery of a similar type to the one that comes with your camera or the Li-ion battery. This will be a good idea especially if you're the type of person who loves taking photos wherever you go. At least when you have an extra battery on standby, you won't miss those important shots.
There are many online shops that cater exclusively to digital camera batteries compatible with most brands. If you're patient enough to look for legitimate online retailers, you will surely find one that offers batteries with identical quality and capacity as to the original ones you're using.
Also when using your Lithium-ion battery, experts recommend that consumers not totally drain it below its minimum voltage of 2.4 to 2.8 volts/cell before recharging. In other words, you don't need to completely discharge the battery before recharging. Another advantage is that this type of battery is capable of being recharged hundreds of times. But keep in mind that not using it for a long time will actually shorten its life to only two to three years.
Write down the number of watt hours and volts listed on the battery. It is useful to write "Wh =" then the number of watt hours then "V =" and the number of volts. This will help keep the notes clear.
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