9V batteries are often found in devices that aren ... voltage regulator to increase the voltage from 2.3V to 9V. With a light load the cap will last up to 3 hours and once discharged it can ...

Many homeowners wonder why their smoke detector batteries seem to have such a short life span compared to those in their everyday electronic devices like the remote control or flashlight batteries.

It will also save other critical data, including engine monitor status that will turn on the check engine light. Here’s how .

All of the common disposable alkaline batteries from AAA to D are single cells. The exception is the 9v battery which actually has six smaller cells inside of it. [Tom] took a look inside three ...