Pauafritta Posted December 11, 2017 Share Posted December 11, 2017 I have left my battery switched on and it is completely flat. I can switch to the secondary battery and start the boat as this should be fully charged. I park my boat on the street and getting the flat battery out to charge it is extremely difficult and I'm not sure the MX5 motorbike battery charger would do the job. So, if i took the boat on the water, using the secondary battery to start it, will running the motor charge up the flat battery? or do i just need to suck it up, buy a new charger and extract the battery from the boat? Link to comment Share on other sites More sharing options...
Nolongeramember Posted December 11, 2017 Share Posted December 11, 2017 First, how old is the battery and how long has it been dead flat for? Link to comment Share on other sites More sharing options...
Omally Posted December 11, 2017 Share Posted December 11, 2017 Mate yep I'd definitely be sucking it up get a decent charger give it a nice deep charge there not to expensive.... Cheers omally Link to comment Share on other sites More sharing options...
Pauafritta Posted December 11, 2017 Author Share Posted December 11, 2017 The battery is only a year old and would have only been flat a week Link to comment Share on other sites More sharing options...
Nolongeramember Posted December 11, 2017 Share Posted December 11, 2017 51 minutes ago, Pauafritta said: I have left my battery switched on and it is completely flat. I can switch to the secondary battery and start the boat as this should be fully charged. I park my boat on the street and getting the flat battery out to charge it is extremely difficult and I'm not sure the MX5 motorbike battery charger would do the job. So, if i took the boat on the water, using the secondary battery to start it, will running the motor charge up the flat battery? or do i just need to suck it up, buy a new charger and extract the battery from the boat? I think an MX5 is a 5 amp charger right? That will do it. You don’t have to disconnect or take out the battery to charge it. Just connect to the terminals. If that is difficult, you can even connect to the main positive and negative lead ends from the battery, wherever they go to. Link to comment Share on other sites More sharing options...
Omally Posted December 11, 2017 Share Posted December 11, 2017 (edited) 2 hours ago, Hateanchors said: I think an MX5 is a 5 amp charger right? That will do it. You don’t have to disconnect or take out the battery to charge it. Just connect to the terminals. If that is difficult, you can even connect to the main positive and negative lead ends from the battery, wherever they go to. Would be heaps better than trickle charging it from the motor anyway..... Depends on the size of the battery to I'm guessing to, I always use the 10amp setting on mine I've heard if it's not enough doesn't clean the plates as well as they get deposits that sit on them Edited December 11, 2017 by Omally Link to comment Share on other sites More sharing options...
Pauafritta Posted December 11, 2017 Author Share Posted December 11, 2017 Thanks for the tips. I have got the battery out of the boat and will leave it on the charger and see what it does. The MX 5.0 does have a setting for bigger batteries so it should work. Link to comment Share on other sites More sharing options...
jeffb5.8 Posted December 11, 2017 Share Posted December 11, 2017 I have the MX5 and it works for me, I left mine on and it was dead for about 3 weeks, so far so good but it did take 20hrs on the recondition setting to fully charge the battery. Link to comment Share on other sites More sharing options...
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