According to the Eveready site, their standard 9 volt alkaline is rated at
595 miliampere hours. According to their battery chart, "typical capacity
rating based on 25 mA continuous current drain to 0.8 volts cutoff per
cell." The chart for this battery says 1000 hours for a 1 mA discharge rate.
If I'm reading this right, this means the battery is considered dead when
the output drops to 4.8 volts -- a Stamp won'r run when the battery gets
this low. I know for sure a BS2e dies when the battery voltage gets down
about 6.5 volts, and I assume the other Stamps would be the same.
The constant current discharge chart for this battery says 1000 hours for a
1 mA discharge rate, and according to the Parallax site, the Stamps draw 20
to 200 microamperes (0.02 to 0.20 ma) in sleep mode, depending on the model.
It would be safe to assume the battery would be good for at least 1000
hours, but who knows whats gonna happen when the battery is low and the
Stamp is reset.
Original Message
> How long can a stamp "survive" on a nine volt battery in sleep mode?
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595 miliampere hours. According to their battery chart, "typical capacity
rating based on 25 mA continuous current drain to 0.8 volts cutoff per
cell." The chart for this battery says 1000 hours for a 1 mA discharge rate.
If I'm reading this right, this means the battery is considered dead when
the output drops to 4.8 volts -- a Stamp won'r run when the battery gets
this low. I know for sure a BS2e dies when the battery voltage gets down
about 6.5 volts, and I assume the other Stamps would be the same.
The constant current discharge chart for this battery says 1000 hours for a
1 mA discharge rate, and according to the Parallax site, the Stamps draw 20
to 200 microamperes (0.02 to 0.20 ma) in sleep mode, depending on the model.
It would be safe to assume the battery would be good for at least 1000
hours, but who knows whats gonna happen when the battery is low and the
Stamp is reset.
Original Message
> How long can a stamp "survive" on a nine volt battery in sleep mode?