9V Battery Backup Circuit using LM7809
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Arduino misconceptions 6: a 9V battery is a good power source
Ben Krasnow: Testing Tenergy 9V NiMH batteries (discharge curve)
9V Batteries – The Quick And Easy Guide For Optimized Devices
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Discharge tests and capacity measurement of 9 volt transistor radio batteries at high current, 100mA to 500mA engineering data
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Monitoring battery voltage to calculate capacity with an Arduino – Dangerous Prototypes
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Configure a low-cost, 9V battery-voltage monitor - EDN
Measuring MAX current of a battery 9 volts, AAA, AA | Forum for Electronics
How many volts are considered dead on a 9V battery? - Quora
