im sure its been talked about before but i do a lot of bank fishing as i don't have a boat. i purchased a light for fishing at night that emits a green glow and is supposed to attract bait fish. i had a quick question. i purchased this Submersible Underwater 210 LED Green Fishing Light Green Fire Boat Pier Dock | eBay my question is. do i need to buy a car battery for this or can i get away with something smaller for a night of fishing. i know if i get a smaller battery it wont stay lit as long and will dim as the battery loses power but i need a battery that will last 12-15 hours of use and still be light weight because i have to carry everything so between my rods and cooler i have backpack and my rods. Thanks again in advance. i looked into the lithium batteries which only weigh 1-5 pounds but there ah rating is only 7ah which would equal to about 2 1/2 to 3 hours worth of use.