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Why did early handheld calculators need 9V batteries? My old TI-30 needed a new battery every few hours. - Quora
What battery is equivalent to 9V? - Quora
Does a 9V battery supply more current than a 6V battery? - Quora
Can an LED be connected directly to a 9V battery? - Quora
How are double A batteries different from triple A batteries? - Quora
Why is it dangerous to lick a battery? - Quora
Why do 9 volt batteries have much lower capacity (mAh) than AA or AAA batteries? - Quora
Why are 9V batteries square? - Quora
Why is it dangerous to lick a battery? - Quora
How many milliamperes are in a 9v battery? - Quora
Why do some electronic devices use AA batteries while others use AAA batteries? How was this decision made? - Quora