The nine volt battery is available in so many brands that it is hard to keep up anymore. I would think that the best one would be a charged one and go from there. I have never had a problem with any nine volt I've purchased, mainly because it is already one of the most expensive batteries sold.
no
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!
no
No.
You can buy 9V batteries from almost any supermarket
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.
very
yes the invert mini takes 1 9v battery. it is in the grip frame. you should get a 9v with the gun/