While on a 20 ft deco stop following a 300 ft 20 minute dive, Petrel battery change notification came on (obviously without battery change). Following the dive, I turned the Petrel off and placed it on a bench, the Petrel turned on spontaneously and then again gave battery change notification. The battery life meter was indicating half. This is a back up to a Predator, but concerning none the less. Any suggestions or advice. Thanks.
Mike
Mike