muddy4x4xfar Posted March 20, 2014 Share Posted March 20, 2014 hi all. just a quick question. if i put a red positive lead from one battery to another the same and the same with the negative. it wouldnt affect affect anything would it? like make it 24v or anything. all im trying to do is start up my defender td5 for the first time and it seems to be drawing alot of juice to do it so my idea is to double up the batteries and put it on a charger at the same time. its nearly there with starting just runs out of juice as its about to . Quote Link to comment Share on other sites More sharing options...
Nigelw Posted March 20, 2014 Share Posted March 20, 2014 As long as it is ++ and -- it is fine you are just doubling the cranking amps so I am told. to make 24V you go + off one to neg off the other and either side is 24V + & - if that makes sense? Quote Link to comment Share on other sites More sharing options...
muddy4x4xfar Posted March 20, 2014 Author Share Posted March 20, 2014 As long as it is ++ and -- it is fine you are just doubling the cranking amps so I am told. to make 24V you go + off one to neg off the other and either side is 24V + & - if that makes sense? brilliant ill give it a go thanks for that Quote Link to comment Share on other sites More sharing options...
tweetyduck Posted March 20, 2014 Share Posted March 20, 2014 No problem....but if your batteries are different ages and different capacities you may get a charge/discharge cycle that will flatten them both eventually. Its a bit of theoretical science but if one sits higher than the other in voltage it will charge the other up until the equalize and then variations is battery can cause this to happen the other way. This cycle goes back and forth. It may not be a major issue if you run your car often but its worth considering if its sitting. The trick would be is get a BIG battery switch between the ++ and only turn it on when starting and driving. Leave it off when you get out the car. Thats a split charge system the manual way. Quote Link to comment Share on other sites More sharing options...
muddy4x4xfar Posted March 20, 2014 Author Share Posted March 20, 2014 No problem....but if your batteries are different ages and different capacities you may get a charge/discharge cycle that will flatten them both eventually. Its a bit of theoretical science but if one sits higher than the other in voltage it will charge the other up until the equalize and then variations is battery can cause this to happen the other way. This cycle goes back and forth. It may not be a major issue if you run your car often but its worth considering if its sitting. The trick would be is get a BIG battery switch between the ++ and only turn it on when starting and driving. Leave it off when you get out the car. Thats a split charge system the manual way. ill bare that in mind aswell. thank you. its mostly for the first time starting it up since the full rebuild and it sucks a lot of juice. im told they usually do Quote Link to comment Share on other sites More sharing options...
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