DIY Rechargeable Multimeter Battery Guide

If you are interested in DIY multimeter batteries, you may want to take a look at this article.
If you are often frustrated because every time you want to use a multimeter, you find that its batteries are frequently dead, you might come up with an idea to build a rechargeable multimeter, so that when it runs out of power you can simply recharge it, and you will no longer need to buy batteries frequently.

If you happen to have two lithium batteries at home, you can connect them in series, bring out the midpoint, and find a lighter case to fit the batteries inside perfectly, creating a different specification.

This is slightly thinner than a 9V stacked battery.

Then you can install a copper nut at the bottom to connect the midpoint of the two batteries.

When charging, you can use this (inside the case is a TP4056 charging circuit), charging the batteries one by one.

When you put it into the multimeter, experiments show that as long as the battery voltage is not lower than 7.7V, the multimeter will not display the battery symbol (low battery warning).

Done.