need some advice on this. my vex has served me faithfully. i've had it for a long time, still with the original battery. i was gonna get a new battery, but the ice came early, so i thought i'd use the old battery till after Christmas. fished a new lake yesterday for the first time. was pretty cold when i started, about 7 degrees, and i drilled holes looking for deep water. found a spot i thought i'd try, but only 9 feet deep. i had to use the low power mode, (seldom do , usually fish 15- 20 fow). it would mark fish, but not my jig. i had to run the gain clear up. 100 % charge when i started. after about 4-5 hours, the charge light went to 50%. got home and was gonna let it warm up before i charged it for today, and in 1/2 hour, the battery gage said 100% charged. hooked it to the charger, charged it till the light came on, like the manual said. went out today, fished shallow water again on low power. it would mark fish, and big baits sometimes, pimples, jiggin raps, but small panfish jigs it wouldn't show. i can see how battery age can affect charge life, etc, but if i can mark fish and not my jig, am i having transducer issues?