Wal-Mart would definitely carry 9 volt batteries. If you find yourself unable to find a Wal-Mart, then both Costco and Radio Shack carry cheap 9 volt batteries. And if push comes to shove, 9 volts can be found at most gas station stores in the United States.
9V batteries are a type of alkaline battery. The alternative is a lithium battery. Alkaline batteries use zinc as an anode whereas lithium batteries use lithium. Lithium batteries produce higher voltage and have a longer lifespan, thus they are more expensive.
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There are several long lasting and dependable 9v batteries available. Duracell Coppertops are a good choice as well as Ray-O-Vac and Energizer Industrial.
the best way is to replace with a known good battery also a voltmeter - read battery under load - it should be near 9 volts
you better not. you need a 9V regulator for this, not a resistor!
You can buy 9V batteries from almost any supermarket
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Yes, a 9v battery can be dangerous if mishandled or ingested, as it can cause burns or internal injuries. Ingesting a 9v battery can also lead to serious health complications or even death. It is important to handle and store batteries properly to avoid accidents.
A car battery has six cells each producing two volts. A 9v alkaline battery has six cells each producing 1.5 volts. There are some obvious differences, like that a car battery can put out hundreds of amps and a 9v alkaline can only put out hundreds of milliamps, a 9v battery weighs 45 grams versus 45 pounds for a car battery, and so on.
"Stronger" isn't a good word here. Given the most common D and 9V batteries, it's more a question of "different" than "stronger". The 9V has a higher voltage, while the D cell has a bigger capacity. What'll be best depends on what you need. It's like trying to decide if a sports car is better than a tractor.
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