Fishfinder Battery Life - How long?

[MGB]

Heres a few batteries to look at. I bought the 12volt 7amp about a month ago. I've used it 5 times. 4 of my outings I fished for 6 hours using the light to help keep it warm for half of the day and had no problem with the battery going dead. When I charged it for my next trip it still had alot of juice left and the charge was complete in about 15 minutes. My 5th trip I used it for 9 hours using the light about 4hours, during my last hour of the day it did not want to operater with the light on but ran fine with the light off.

http://www.radioshack.com/product.asp?ca...960%2D0471

http://www.radioshack.com/product.asp?ca...960%2D0471
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