Turn the sonar unit on. If it doesn't work, make sure the battery termi- nals are making good contact against the battery contacts. Also check the wiring connections on the battery adapter. The red wire on the power cable should be attached to the red wire on the battery adapter and the power cable's black wire should be connected to the black wire on the battery adapter.
If it still doesn't work, check the battery voltage. Most of the complaints we receive about portable units result from stale batteries. Make sure the ones you buy are fresh.
In cold weather the efficiency of dry cell batteries drops with the tem- perature. We find it a good idea to have the sonar unit good and warm along with the batteries before we leave home.
If the batteries do lose a charge, you can sometimes restore them by placing them in a warm room or car interior. A better way is to replace them with batteries that have been kept warm.
WARNING:
Never heat the batteries over an open flame or direct hot air onto them. A fire or explosion could result.
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