stevex Posted November 22, 2015 Share Posted November 22, 2015 Hey all been having dramas with my batteries lately and thought its time for a upgrade. Wats happenning is when i chase bait threw the night and decide to achor up to get some shut eye for 4 or 5 hours i leave everything off except the bait tank and wake up and the battery or batteries are dead (depending if i remember to switch it to one or both batteries). Also if i do drain one batteries just the one battery most the time dies trying to start really needs both batteries to get it going. My motor is a yamaha v4 115hp. Ive notice the batteries that are there now arent deepcycle .i dont mind getting bigger batteries then they need so im certain i wont need to call marine rescue anymore again any help would be great Link to comment Share on other sites More sharing options...
Shiremm Posted November 22, 2015 Share Posted November 22, 2015 You need to get your batteries, charging system and battery switch tested. You should have one deep cycle battery installed as well as a starting battery. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
antonywardle Posted November 22, 2015 Share Posted November 22, 2015 (edited) If you have a one good battery and one bad one, then the bad one will steal all the power from your good one, depending on how they are connected. When you have your outboard running, check the battery with a multi-meter. It should be reading 13.x volts which means that your alternator is charging your battery. Do you charge your batteries after/before a trip out? Batteries have a finite life, and depending on how they are used, it can be short or long. Have a look ant let us know what batteries you've currently got. Important thinks to look for are is the bit that CCA, if it is a starting battery and A/HR if it is a deep cycle. I'm guessing you knly have starting batteries. I can't see a deep cycle going flat after a few hours, unless you are plugging in a kettle or something lime that! I had a look at the specs for a 1500GPH bilge pump which you might have in a live bait tank. It draws 4.8 amps, this means if you have a 120AMP hour battery (deep cycle) in theory you could run it for 25 hours, (120/4.8). You don't get that. Sounds like you have a flat.stuffed car battery ;-) Anyway, let us know what you have and more experiance people than me can tell you what the problem is Edited November 22, 2015 by antonywardle Link to comment Share on other sites More sharing options...
stevex Posted November 22, 2015 Author Share Posted November 22, 2015 On the dash when im driving it ready 13.8 to 14.4 but the live bait tanks kills em in a few hours and once i had both batteries fully charged and went to start it with only one battery and it rurned over 4 times then it was dead .ill habe to go see wat batteries i have in there now but i no they not deepcycle is it better to run 2 deepcycle or just one Link to comment Share on other sites More sharing options...
stevex Posted November 22, 2015 Author Share Posted November 22, 2015 I might add whens the motors on it never goes dead its only when i achor up and sleep 4 a few hours they flat as Link to comment Share on other sites More sharing options...
antonywardle Posted November 22, 2015 Share Posted November 22, 2015 Ok, so that sounds like your charging system is good but your batteries are on the way out. Typically you have a starting battery and a deep charge battery. Start the boat on the starting battery and run the electronics on the deep cycle, Do you have one of those 1 2 both off switches? Link to comment Share on other sites More sharing options...
stevex Posted November 22, 2015 Author Share Posted November 22, 2015 Yeah i have to start it on both tho cause just the one battery wont start it if its cold and both batteries are the same Link to comment Share on other sites More sharing options...
Shiremm Posted November 22, 2015 Share Posted November 22, 2015 If one battery can't start a 115 Yamaha you definitely have a problem Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
antonywardle Posted November 22, 2015 Share Posted November 22, 2015 If you need the both to start then you've got a problem. Can you start the boat on either the 1 or the 2 setting only? Sounding a bit like my boat when I first got it! Link to comment Share on other sites More sharing options...
stevex Posted November 22, 2015 Author Share Posted November 22, 2015 I have only tryed it on the 1 once till it died put itcon both and it started so i need one starting battery and one deep cycle do use no wat size batteries i need Link to comment Share on other sites More sharing options...
batfishing Posted November 22, 2015 Share Posted November 22, 2015 I would run with 2 x N70's, We have a pair of Deep Cycle N70's on the shelf at present, Adrian will do you a great deal on one of those, I would match it with a N70 start battery. Would also be doing away with the 1 - 2 - BOTH battery switch and running 2 Battery switches. 1 for the start and 1 for the house. Run the motor off the start and everything else off the house Deep Cycle. BEP do a bank of switches, Start, House, Emergency Parralled and Smart Charge Relay. It is my personal preference on how to set up dual batteries. We can supply that and would even cut and crimp battery leads to size. We have just finished setting Adrian's Boat up exactly this way, have a chat to him. Roadrunner 9607 5774 Sent from my iPad using Tapatalk Link to comment Share on other sites More sharing options...
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