Rob_88 Posted August 2, 2005 Report Share Posted August 2, 2005 Does anyone have any idea on the charge time of a Yuasa 12V 7Ah battery. Thanks, Rob Quote Link to comment Share on other sites More sharing options...
Will Beasley Posted August 2, 2005 Report Share Posted August 2, 2005 This depends on the output current of the charger. To work out the charging time you simply divide the capacity of the battery (in Milliamps) which in your case is 7000 milliamps by the output current of your charger. Usually most trickle chargers are about 800 Ma so divide 7000 by 800 and it comes to 8.75 (the .75 meaning three quarters of an hour). Hope that helps. Quote Link to comment Share on other sites More sharing options...
Rob_88 Posted August 2, 2005 Author Report Share Posted August 2, 2005 Thanks, that helps alot. My charger is 700MA and the batery 7000MA so i guess that means a 10 hour charge then :o Cheers, Rob. Quote Link to comment Share on other sites More sharing options...
ernyha Posted August 2, 2005 Report Share Posted August 2, 2005 My charger is 700MA and the batery 7000MA so i guess that means a 10 hour charge then :o Cheers, Rob. Rob that is correct assuming of course that your battery is dead flat to start with. Quote Link to comment Share on other sites More sharing options...
sussex lad Posted August 2, 2005 Report Share Posted August 2, 2005 Hi guys, Just a quickie but i'm pretty damm sure its not a good idea to run these type of batteries flat! Always leave them with some charge in them. Cheers, Brian... Quote Link to comment Share on other sites More sharing options...
Rob_88 Posted August 2, 2005 Author Report Share Posted August 2, 2005 Hi guys,Just a quickie but i'm pretty damm sure its not a good idea to run these type of batteries flat! Always leave them with some charge in them. Cheers, Brian... Yes good question, should you leave them fully charged, dead flat or with just a bit of life in them? Cheers, Rob. Quote Link to comment Share on other sites More sharing options...
malcolm Posted August 3, 2005 Report Share Posted August 3, 2005 (edited) These batteries generally should never be completely flattened. In fact they should ideally be kept as fully charged as they can be. Charging for 10 hours at a charge rate of tenth of full AH capacity won't do any harm. There are batteries specially designed to be run flatter. They are called "deep discharge" or "deep cycle" batteries. Is yours one of these? In any case it is very difficult to determine the state of charge of a battery, particularly in a field. (You could consider the off load terminal voltage taking into account the ambient temperature!) So you could have a stab at guessing when the rotary is slowing down. This is gradual and difficult to judge. It is even more difficult to judge if you have a speed controller. In any case you still have to use the sodding thing. So my advice would be use it, but not until the rotary stops turning if possible, take it home ang give it 10-12 hours at (about) a charge rate of tenth of full capacity; 700mA (or 800mA) in your case. In other words it is impossible to treat it perfectly, but a slight overchage is better than running it flat. Or you could buy a three stage charger, but they are v. expensive and still won't address your discharge problem. Cheers Malcolm Edited August 3, 2005 by malcolm Quote Link to comment Share on other sites More sharing options...
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