https://www.baldengineer.com/tag/9vRecent content in 9V on Bald EngineerHugoen-USThu, 18 Jan 2018 20:58:13 +0000https://www.baldengineer.com/9v-battery-energy-density.htmlWed, 23 Mar 2016 13:00:53 +0000https://www.baldengineer.com/?p=5869Previously I wrote up why the 9V battery sucks. As I thought more about that post, I realized, I never explained how much energy is in a 9 V battery versus say a couple of AA batteries. For this post, I am going to break down the energy stored in a 9 V battery, the small rectangular kind and compare it to what you get with 6 AA batteries. Yes, it takes up a little more space, but you might be surprised by the difference.

https://www.baldengineer.com/9v-batteries-suck.htmlFri, 14 Feb 2014 12:00:37 +0000https://www.baldengineer.com/?p=2296Smoke detectors beep when their backup battery dies, which always seems to occur in the middle of the night (at least for me.) These backup batteries are usually a small rectangular 9V. They have become popular choices for electronics projects. If you need your Arduino project to last longer than a day, this isn’t the battery you want to use. Here’s why. What is a 9V Battery The 9v battery comes in a standard package about 25mm wide, 16mm tall, and 47mm long. On top there are standard snap-style connectors. The design of these connectors prevents you from attaching the battery backwards.