The best emergency battery ive found is Energizer Ultimate Lithium (NON-RECHARGABLE). They come in standard sizes and voltages (9V and AA). They have a 20-year shelf life, no liquids to leak out or corrode, no pressure build up when discharged at high rates. A 9V is spec'ed at 1A (but voltage does drop to about 7.5V when discharging at 1amp rate).
Well documented datasheets available from Energizer.
The problems:
- fairly expensive (but may be considered a cheap solution - depends on the situation)
- cannot be shipped without jumping through the hurdles of shipping Lithium batteries
- one to two ohms of internal resistance at 1A discharge rate.
- not rechargeable so they may need to be changed after several short power outages.
They definitely are worth the hassle in my industrial applications.
Well documented datasheets available from Energizer.
The problems:
- fairly expensive (but may be considered a cheap solution - depends on the situation)
- cannot be shipped without jumping through the hurdles of shipping Lithium batteries
- one to two ohms of internal resistance at 1A discharge rate.
- not rechargeable so they may need to be changed after several short power outages.
They definitely are worth the hassle in my industrial applications.