hi my rxp wont even turn on when lanyard key is inserted , think the battery was dead i took it out for the winter and recharged it last week but it wont even beep or the display wont come on , before i put it away for winter i lost the use of my v-trim and a depth finder came up on it but i dont have a depth finer is that cause i disconnected the battery has it lost its memory or is the battery done even no its reading 12.6 volts