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Survival Actual
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Battery Lifespan
The life of a rechargeable battery operating under normal conditions is generally between 500 to 800 charge-discharge cycles. This translates into one and a half to three years of battery life for the average user. As your rechargeable battery begins to die, you will notice a decline in the running time of the battery. When your two hour battery is only supplying you with an hour's worth of use, it's time for a new battery..
http://www.warehousebatteryoutlet.com/batteryinfo.asp?flag=9

Regular alkaline batteries have a long storage time as long as you dont install them in a device. Energizer company (i think) boasts a 10 year shelf life on theirs. I don't know if thats true or not. Lithium batteries also have a very long shelf life.

If you're planning on surviving for more than two years, i would recommend not relying on batteries at all.
Rechargeable batteries must be stored in a fully charged state!
 
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