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Ausfish Platinum Member
12v motorbike/jetski battery duration
Hi again, Has anyone played around with a motorbike/jet ski 12 v batteries? Im sick of lugging a heavy big deep cycle car 1 with me just to run my stereo and sounder. As my motor is not electric start anyway. And they are half the size and weight. I am trying to way up the math for how long it will last before going flat. I dont mind recharging it the night before a days fishing. But will it last a day running only these 2 items?? Any help....
BD
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Ausfish Bronze Member
Re: 12v motorbike/jetski battery duration
You can buy motorbike size batteries from some boating stores, I know that BCF sell them. They tell me that the plates in them are a bigger size so that they don't shatter with the wave motion. I don't if this is true or not. A smallish battery ($30) only my sounder I am told gives approx 20hrs of sounder (its a real cheapy) Oh definitely make sure you get one thats a sealed cell, should be a bit cleaner.
Cheers
Rob
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Ausfish Platinum Member
Re: 12v motorbike/jetski battery duration
All reports ive got is that they are tuff as aswell. I mean if it can handle a jetski then they must be robust. But i want to find out how long it will run for before i buy 1. I used to know all this stuff, but now im confused after learning about generators and fridges and sign waves etc... etc... But my stereo runs a 10 amp fuse and my sounder runs a 2 amp fuse. So it cant be drawing anymore than that. Any maths wiz's here??
BD
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Ausfish Platinum Member
Re: 12v motorbike/jetski battery duration
Wow finga nice work mate.. Thanks. But i will find out what the radio and sounder draws and find out the battery etc.. And can you work it out for me before i go wasteing more money. Because 1 hour doesnt sound too good to me.
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Ausfish Addict
Re: 12v motorbike/jetski battery duration
Mate, the sounder will not draw 2A.
It'll be more like 1/2A for the sounder so the radio would be the deciding factor as a lot of the doof doof radios do draw 10A.
What radio is it??
If there's a reasonably big sparky contractor near you go and see them and ask about the batteries out of the emergency signs/lighting and battery backups.
Or the all day, all night electric wheelchair, mobility scooter fixer-upperer.
They're usually gell batteries and better in the boat.
Last edited by finga; 15-06-2007 at 08:43 AM.
I intend on living for-ever....so far so good
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Ausfish Platinum Member
Re: 12v motorbike/jetski battery duration
I just looked right through the book and nothing. Even on the box it says nothing. Its a supercheap special mate.. . It a superworks marine cd player that i use for basically the radio only. How much does a normal head unit use??
Thanks bd
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Ausfish Addict
Re: 12v motorbike/jetski battery duration
being a "supercheap" special, it will probably be made to a price and as such, will draw more than a "good" unit, BUT at most only about 1 Amp or so, I have used a motor bike battery for Prawning when doing early season "looking" and with an underwater light (fairly high current drain) it lasts for well over 4 hours, so I'm sort of guessing that just a radio and sounder, if used as needed would last 3 or 4 times longer than that (maybe) also, why do you have to carry the battery anywhere? can't you just mount it in a box in the boat?? then just take it out IF it is not needed.
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Ausfish Platinum Member
Re: 12v motorbike/jetski battery duration
Noelm i only have a smallish boat and i have made a realy cool box for the stereo/sounder and battery that i remove and sometimes i like the extra space so i take it out. But the battery weighs so much i cant lift the whole thing on my own!!! So i want to down size it. I just rang bcf and they have battery for $79 that is a marine grade jetski 1 and is 17 amp hours. How does that sound??
ps. even supercheap cant find the amp hours the cd player draws either. i just annoyed them... and to answer your question the battery is not holding charge anymore anyway... It sat for a few months without being used or recharged.
Last edited by BenDover; 15-06-2007 at 09:04 AM.
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