magpye Posted July 8, 2012 Share Posted July 8, 2012 I received this in the post yesterday. Q. When is a 7Ah battery not a 7Ah battery? A. When its temperature is below or above 20C (68F)! "Remember, Ah capacity available (irrespective of stated Ah size) is affected by battery temperature as well as state of charge" Examples. 5Ah available @ 10C (50F) --------------- 9Ah available @ 30C (86F) From tomorrow on, I'll be replacing EVERY 7Ah battery that I find. Na, perhaps not, I might find one at 20C (68F) Someone told me I was ignorant and apathetic, I don't know what that means, nor do I care. Link to comment Share on other sites More sharing options...
james.wilson Posted July 8, 2012 Share Posted July 8, 2012 It is true but also battery charge voltage 'should' be adjusted to suit ambient temperature. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
fozzies Posted July 8, 2012 Share Posted July 8, 2012 Surely most batteries are closer to 30 degrees than 10, sitting in their nice comfy enclosures along with mr transformer, so nothing to worry about? Link to comment Share on other sites More sharing options...
james.wilson Posted July 8, 2012 Share Posted July 8, 2012 All batts claim their A/h at a set ambient temp. If using in a higher ambient temp then the capacity is increased while the life is decreased (if charging not reduced) and vice versa. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
Lwillis Posted July 10, 2012 Share Posted July 10, 2012 I always wondered why the little red ACT. Battery testers showed the temp . New gold one I've got doesnt tho . Link to comment Share on other sites More sharing options...
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