Game Boy Cartridge Battery Replacement

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If you find your Game Boy experiencing save game issues, where progress is lost or becomes intermittent, it may be time to replace the internal battery.

The internal battery within Game Boy cartridges serves a crucial role in preserving your game saves. Over time, these batteries degrade, potentially leading to data loss.

Before using this guide, inspect the battery to test the voltage with a multimeter. Typically, if the battery range is not 1 digit over the decimal point when measured with a multimeter, then that is a sign that the battery should be replaced.

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Game Boy Cartridge Battery Replacement, Battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Game Boy Cartridge Battery Replacement, Battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Use the screwdriver to loosen the screw on the cartridge.

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Game Boy Cartridge Battery Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Switch on your multimeter and select the Voltage (V) mode. Then, test the voltage of the battery in the cartridge.

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Apply some of the flux paste to help desolder the soldered areas on the battery.

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Be careful when handling a fully heated soldering iron, as it can burn you.
Use the soldering iron once it heats up fully. Then, heat up the soldered areas with the iron.

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Game Boy Cartridge Battery Replacement: crwdns2935265:05crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Pick up the solder with the desoldering braid.

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Game Boy Cartridge Battery Replacement: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Wipe off any excess flux paste.
The flux paste can damage the circuit board if not removed completely or spread to other areas on the circuit board.

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Game Boy Cartridge Battery Replacement: crwdns2935265:07crwdnd2935265:01crwdnd2935265:02crwdne2935265:0

Game Boy Cartridge Battery Replacement: crwdns2935265:07crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

Make sure to align the battery's positive side where the positive indicator is and the negative side where the negative indicator is.
Use the soldering iron and soldering wire to solder both sides of the battery into place.

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Game Boy Cartridge Battery Replacement: crwdns2935265:08crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

Switch on your multimeter and select the Voltage (V) mode. Then, test the voltage of the battery in the cartridge.
The battery has to have at least 1.5V. If the multimeter reads a negative value, then most likely, the terminals are placed opposite, so switch them around and check the resulting value once more.

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