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https://www.powerstream.com/9V-Alkaline-tests.htm#:~:text=Testing%209%20Volt%20Batteries%20for%20mAH%20capacity%20and,%20450%20mAH%20%203%20more%20rows%20
https://www.skipperwbreeders.com/recommendations/often-asked-how-many-amps-can-a-9v-battery-supply.html
9-Volt Batteries The voltage on the industry standard 9-volt battery is, obviously, 9 volts. Energizer’s 9-volt battery’s milliamp hours equal 610, or 5.49 watt -hours. Thus, the 9-volt battery has a greater capacity than the AA, which means that it is likely a 9-volt Energizer battery will outlast a AA battery.
https://www.powerstream.com/9V-Alkaline-tests.htm
https://www.reference.com/science/many-amps-9-volt-battery-112e65ad007368bc
Nine-volt batteries produce 400 to 500 milliampere-hours at 8 milliamperes. Ampere-hour is a unit of battery capacity, while amperes measure electric current. An ampere-hour measures the amount of electric current a battery can supply in one hour before exhausting its storage of energy. While a 9-volt battery should last one hour if supplying 400 to 500 …
https://data.energizer.com/pdfs/max-eu-9v.pdf
Milliamp-Hours Capacity Battery Selection Indicator High Drain Devices Moderate Drain Devices Continuous discharge to 4.8 volts at 21°C ENERGIZER MAX Specifications mm (inches) No added mercury or cadmium Industry Standard Dimensions PRODUCT DATASHEET 0 200 400 600 800 25 100 300 500) Discharge (mA) 17.50 (0.689) 15.50 (0.610) 48.50 (1.909) 46 ...
https://www.handlebar-online.com/writing-tips/what-is-the-mah-of-9v-battery/
Energizer’s 9-volt battery’s milliamp hours equal 610, or 5.49 watt -hours. Thus, the 9-volt battery has a greater capacity than the AA, which means that it is likely a 9-volt Energizer battery will outlast a AA battery.
https://data.energizer.com/pdfs/522.pdf
9V Classification: Alkaline Chemical System: Zinc-Manganese Dioxide (Zn/MnO 2) Designation: ANSI 1604A, IEC-6LF22 or 6LR61 Nominal Voltage: 9.0 volts Operating Temp:-18°C to 55°C Typical Weight: 45 grams Typical Volume: 21 cubic centimeters Shelf Life: 5 years at 21°C Terminal: Miniature Snap Milliamp-Hours Capacity ENERGIZER 522 Specifications mm (inches)
https://www.mkbattery.com/blog/understanding-battery-amp-hours
The C rating tells you how many amp hours the battery can provide for a very specific period of time. For instance, at C/5 a battery might safely provide 26.8 amp hours. This means that is supplies 26.8 amps in the duration of 5 hours without dropping off. Meanwhile, the same battery may safely provide 36 amp hours for a period of 100 hours.
https://www.electro-tech-online.com/threads/what-mah-value-does-a-standard-9v-battery-have.8873/
You should expect at least 4 hours out of your brightly lit LED. Typical forward drops for normal LED (for which a 100mA device is not normal) I am talking a T1 type or SMT type that runs up to around 20mA. Green is about 1.9V Blue (maybe white also - not sure) more like 2.5 - 3.5V Reds, ambers and similar are less than 1.9V I believe
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