The solder pins of the Ensoniq SQ-2's backup battery are circled in this photo.

Probe the solder pins to measure the battery's voltage (right).

A reading of 2.497 volts is too low for a 3-volt battery, so the Ensoniq's error message was justified.

Use care when de-soldering the battery's pins.  There is foil on both sides of the circuit board and the holes are plated thru.

In addition, the circuit traces are quite narrow.  If you don't have experience reworking double-sided boards, you should use a vacuum pump desoldering tool.

When installing the new battery (right), insert its plus and minus pins into the holes marked for them.

The pin connected to the bottom side of the battery should go into the hole marked negative (-), as seen here.

The pin connected to the top (imprinted) side of the battery should go into the hole marked positive (+), as seen here.

It's important that the pin spacing of your replacement battery matches the hole spacing on the PC board.

The Panasonic replacement battery seen here is available on our Battery Page.

After soldering the new battery to the board, reverse the disassembly procedure and power up the workstation.

The Low Battery warning should now be gone and you can reload any custom data that you may have saved.