Easy fix: put the battery on the outside. Also easy to use a plug in adapter so no battery is even necessary. This method has minimal impact on the device, so it is easy to go back to keeping the battery on the inside.
The example here is a digital multimeter with inconvenient access to its battery.
Step 1: Tools and Material
- The device to modify, here a digital multimeter.
- Battery Clip - hard to find, I found mine at Lowes in the hardware "Hard to Find" section
- Dead 9 volt batteries for salvage
- Soldering Iron.
- Misc; small tools
Step 2: Battery Connector
For our use we will put 2 clips on the wire. One detail is that the positive wire is connect to diferent sides of the clip at the two ends. This is to make sure the correct polarity is delivered to the meter. Note that the connector needs to be assembled after threading it through the case ( see next step ) Insulate the clip, I used tape, other methods including hot glue also work.
Step 3: Modify the Meter
Close up the case. Connect up the battery. Welcome to the age of easy battery change.
Step 4: Use a Power Supply
- Make sure the supply is really 9 volts DC do not trust the marking on the supply.
- Be careful to observe the correct polarity.
- Typically the battery negative is not the common terminal on the meter. In this case you should not use a common ground for the meter supply with the rest of you equipment, Let the supply "float".