DIY Multimeter Battery: A Rechargeable 9V Alternative

If you are interested in DIY solutions for multimeter batteries, you may find this article useful.

If you happen to own a multimeter, you may have experienced situations where the 9V battery inside the meter suddenly runs out of power during use. This can be quite frustrating. At that moment, you might come up with the idea of making a rechargeable replacement battery yourself.

You are probably very familiar with this type of lithium battery. By connecting two cells in series and bringing out the center connection point, you can create a battery pack. You can then find a lighter case and fit the batteries inside perfectly, creating a new battery format.

Slightly thinner than a standard 9V battery.

Install a copper nut at the bottom and connect it to the midpoint between the two batteries.

Use this charger for charging (the casing contains a 4056 charging circuit). Charge each battery cell individually.

Insert it into the multimeter, and the project is complete. According to testing, as long as the battery voltage remains above 7.7V, your multimeter will not display the low-battery warning symbol.