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.
More Info:
Cool 7 inch HD Touch Screen Car DVD GPS Player Navi Official SD Map USA Warranty, GPS Navi 7" In Dash Motorized Car Stereo DVD CD VCD AM/FM Player Ipod BT PIP, G867 7" HD TouchScreen Car Road DVD GPS Navi Player Map RDS FM Rotating Display, HD LCD GPS Navi 2 Din 7" Car Stereo DVD CD Player Radio Ipod Bluetooth+Camera, Great GPS Navi 7" Flip Down Car Stereo DVD CD VCD Radio MP3 Player Ipod BT PIP, GPS Navi 7" LCD/TFT Flip Down Car DVD CD Radio Player Ipod Bluetooth+Camera, BEST GPS Navi Device 7" In Flip Down Car DVD CD VCD Radio Player Ipod BT PIP, FORD FIESTA 2005 FUSION 2005 DVD Player Radio GPS Navi Navigation Stereo BT IPOD, TOYOTA HIGHLANDER 2002-2007 In-dash GPS Navi Special Custom Car Radio DVD Player, GPS Navi 7" 800x480 Flip Down Car DVD CD Radio Player Ipod Bluetooth+Camera, TD604G GPS 6.2" Double 2 DIN Digital Touch Screen Car DVD Player Bluetooth Navi, Honda CR-V 8" Car GPS Navi DVD Player XTRONS Digital TouchScreen IPOD TV IPOD, FOR Peugeot 307 Peugeot307 Car DVD Player GPS Navi iPod Bluetooth TV IPOD PIP, 7" Digital TouchScreen Car CD DVD GPS Navi Player Map RDS FM Rotating Display, TOYOTA FJ CRUISER In-dash GPS Navi Special Custom Auto Radio Car DVD Player, Cam+ 7" HD LCD TouchScreen Car DVD Player GPS Navi iPod Warranty Stock in USA, Sale 7 inch HD Touch Screen Car CD VCD DVD GPS Player Navi USB PIP Map Warranty, Benz A-Class B-Class (W169) & B CLASS (W245) 2005-2010 DVD Player with GPS Navi, D709G CAR touch screen 1 DIN SAT NAVI CD DVD Player GPS TV USB SD Bluetooth, Audi TT 2006 2007 2008 2009 2010 2011 DVD Player Radio Headunit GPS Navi iPod , Ouku GPS Navi 7" In Flip Down Car Stereo DVD CD VCD AM/FM Player Ipod BT PIP, GPS Navi Unit 7" In Motorized Car Stereo DVD CD VCD AM/FM Player Ipod BT PIP, TOYOTA 4RUNNER 2004-2008 2009 In-dash GPS Navi Special Custom Car DVD Player, BEST GPS Navi 7" In Dash Motorized Car DVD CD VCD Radio Player Ipod BT PIP, Double 2 Din GPS Navi 7" In Flip Down Car DVD Player DIVX Ipod Bluetooth +Map, HD Digital Screen 7" Car Stereo DVD CD Player GPS Navi Radio Ipod Bluetooth+Map, 7 inch HD Touch Screen Car In Dash VCD DVD GPS Player Navi USB PIP Map Warranty, 7" HD 2Din Indash Car DVD GPS Player Navi Genuine Map USB Rotating Display, Rear Cam+ 7" HD TouchScreen Car DVD Player GPS Navi Radio Warranty Stock in USA, 7" One Din Deck Car DVD Player GPS NAVI FM/AM Bluetooth iPod TV Warranty, Car DVD Player 2 Din 7" Touch Screen GPS Navi RDS SD PIP+Free CAMERA, Cool 7" Double Din Car Dash DVD GPS Player Navi Sygic Map Warranty, 2Din HD LCD TouchScreen 7" Car DVD CD Player GPS Navi Device Radio Bluetooth+Map, Ouku 7" In Dash HD Car CD DVD AM/FM Player GPS Navi Ipod Bluetooth Radio+Map, DVD/GPS/DVB-T/Navi/Autoradio Player MERCEDES CLS/CLK ML Series W209/W219, TOYOTA COROLLA 2002 03 04 05 2006 In-dash GPS Navi Special Custom Car DVD Player, Ford Car DVD Player GPS Navi radio Stereo For Ford Mondeo New Focus S-Max Kuga , TD604G GPS 6.2" Double 2 DIN Digital Touch Screen Car DVD Player Bluetooth Navi, Honda CR-V 8" Car GPS Navi DVD Player XTRONS Digital TouchScreen IPOD TV IPOD, D709G CAR touch screen 1 DIN SAT NAVI CD DVD Player GPS TV USB SD Bluetooth, GPS Navi Unit 7" In Motorized Car Stereo DVD CD VCD AM/FM Player Ipod BT PIP, Double Din GPS NAVI BT Call Radio HD TV Car DVD Player In Dash 7" Touch Screen, GPS Navi 7" In Dash LCD/TFT Car Stereo DVD CD VCD AM/FM Player Ipod BT PIP, Cool GPS Navi 7" Flip Down Car Stereo DVD CD VCD AM/FM MP3 Player Ipod BT PIP, BMW E46 E39 E38 E53 M5 MK4 DVD NAVIGATION GPS COMPUTER NAVI RECEIVER OEM !!!!, BEST GPS Navi 7" In Dash Motorized Car DVD CD VCD Radio Player Ipod BT PIP, BEST GPS Navi 7" In Dash LCD/TFT Car DVD CD VCD Radio Player Ipod BT PIP, 2Din 7" Motorised Indeck Car DVD Player GPS SAT Navi Stock in USA, ISO 2 Din 7" Car DVD CD Player GPS Navi Ipod Bluetooth+Map+Face Panel+Camera, BEST 2 Din 7" Car DVD CD Player Monitor GPS Navi Radio HD LCD Touch Screen USA,
