EEGer Displays "Check Polarity or Replace Battery" Message

For J&J, ProComp, or any other battery-powered amplifier, this error message is telling you to replace your batteries, or to check that they are installed correctly (i.e., that they have the proper orientation).

Remember to disconnect any cables between the amplifier and the computer before changing or re-orienting batteries!

This message may also display if the battery voltage in your amplifier isn't high enough. Certain battery brands retain a higher voltage longer than others. If this message persists after putting new batteries in, the new batteries still may not be reaching the correct voltage level of a different brand.

The minimum voltage level for the J202 amplifier is 4.5 V.