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need an advice for a boat battery?
i've just bought my first boat its 4.7 quintrex ali fitted with 2x20hp manual start motors i need a battery to opreate navi lights + GPS + fishfinder for now in the future i'll add a mp3 player i'm thinking to get a regular car battrey but i don't know what AMP or size
note that the season is just 6 months so i don't mind to get a new one after 6 months 
or would you guys recommend marine battery.
thanks
thanks guys the motors are mariner outboard 20ho 90s
which model of these deep-cycle batterirs would suit my needs
copy and paste yhe link
http://www.firststartbatteries.com.au/battery-range.html?gclid=COyf4dfzgpcCFRs-awodWXrOXw
thanks alot
You don't have much of a load at this point, but get yourself a good quality marine deepcycle, a cranking battery won't last 6 months in a deepcycle application. Marine batteries are (at least theoretically) built to withstand the extra shock & vibration you get on a boat.
You want to charge it soon as you get home, and top it off every couple weeks if you don't use it -- storage in a discharged state is a common cause of premature battery failure.
what brand/year motors? some manual starts have the charging circuits anyway -- won't be more than 4 or 6 amps but that might do the trick with as little demand as you're putting on it.
I use an interstate deepcycle for cranking and accessories, and a walmart everstart group 29 deepcycle for the trolling motor.
+++++++++++++++++++++++++++++++++++++++++
"thanks guys the motors are mariner outboard 20ho 90s
which model of these deep-cycle batterirs would suit my needs"
sorry I don't know much about mariners' charging circuits.
Dang those AGM batteries are expensive -- even if those are quoted in AU$. They also require a different charging algorithm than ordinary wet-cell batteries, so be sure your charger has an "AGM" setting.
My personal philosophy is, the biggest, heaviest deepcycle you can afford (of course, very small craft have to consider weight) -- on a boat, "excess battery capacity" is called "contengency reserves".
Nav lights will draw maybe 6 or 8 amps, fishfinder a few milliamps -- for those, a 50 amp hour batt would last all night. A plain GPS receiver won't add much, but some of those fancy navionics units are pretty power hungry. The stereo, it depends entirely on the amplifier.
75 AH would *probably* be sufficient -- but I'd hate to cast off with less than 90 AH or more.
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tech-ER - Global Positioning System (GPS) Fish Finder
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