The shelf life for this battery is between 8-10 years if it is unused. Most batteries have a shelf life of 5-10 years unused. So the choice is yours my friend.
You can look on Amazon for CR1225 batteries. You can also look at your local stores for these batteries. Amazon often has low price batteries. It is really important to find a good quality battery though.
AAA is the size of the battery, there are many types and makes of AAA battery and the shelf life for each is different.
The crl225 battery is just a standard 12 volt battery. You can get another version, or a replacement battery for this, for about $8 dollars from Amazon or eBay.
When you need to replace your coin battery, note the numbers and letters on the back. If the local electronics store or big box store does not carry your battery, do not throw the device away. There are replacement batteries on the market made by several manufacturers. The CR1225 battery replaces several name brand types such as Ever ready ECR1225, Maxwell BR1255, and Renata CR1225. It is widely available online and is inexpensive. Look for free shipping.
I would not buy one that is over 6 months old. But the shelf life is at least a year. After the battery sits on the shelf for over 3 months it is a good idea to charge it before putting it into service.
AA battery have a 7 year shelf life on average.
Most 9-volt batteries have an estimated shelf life of up to ten years. At the minimum, they will have a shelf life of four years. Most packages of 9-volt batteries will claim a shelf life of somewhere between seven and ten years.
Chemicals in the batteries will react with air.
There are a host of online merchants that sell lithium battery rechargers. For a reputable dealer, I recommend: http://www.shopwiki.com/d/285543/294950512/CR1225-~-Lithium-Battery-~-5-Batteries-~-Generic-Brand .
It depends on how new the battery is (in other words, how long it has been sitting on the shelf), but in most cases it will.
I would not buy any battery over 6 months old.
if you mean shelf life they last for years if stored properly