Aqua-Vu fullsize camera systems will run fine at 14-volts. HOWEVER, when used internally, our charges will not fully charge a 14v lithium battery. Our chargers will provide some charge (13.4v) to the battery but it would not fully charge and our charger is about a 1ah charger so it would take 19 hours to under-charge it. While this is not unsafe, in the short run it would not fully charge the battery and in the long run it would degrade the life of the battery.
A great work around for anglers who want to use 14v Lithium batteries or other external batteries would be to use our Universal-Gator accessory power cord. Keep the battery external and use the provided charger that came with the battery for charging needs.