Guys, I sent Greg at Hummnibird an email on this but I wanted your thoughts. Yesterday was my first full day I had to go out with my two new toys...a 787 and a 997. Both are linked to the same battery. After 4 hours I got low voltage warnings on both units almost simotaneously. Shorty after that both units shut off. When I got home and put the charger on the battery it was, indeed, low. Do these units draw too much power to have them on one battery for a full days fishing or could this just be a bad battery?