seanycozzie24v Posted February 2, 2013 Share Posted February 2, 2013 another question i have a 9.6v 3700mah battery and a charger that charges at 300ma. how do i know the batterys actually charging? because if i plug the charger int the wall with out a battery no light comes on but if i plug a battery in it turns red. the funny thing is though. if the charger is unplugged and i plug the battery in the red light comes on?? heres all the info from the charger constant current source model bt02340 pri 230v~50hz 11.3w SEC 1.2v~12v...~ 50ma-80ma-120ma-180ma-240ma-300ma 3.6VA (MAX) Link to comment Share on other sites More sharing options...
RR01 Posted February 2, 2013 Share Posted February 2, 2013 The easiest way is to either borrow or buy a multimeter to check the voltage (try Maplins if you don't have one). Take a reading before you charge it and another after. If the voltage has increased then the charger is working. A fully charged 9.6V battery should give a reading of about 11.2V. The equation for working out the total charge time is: mAh of battery x 1.5 (if a NihM) divided by charge rate = hours, so for your battery it's 3700 x 1.5 / 300 = 18.5 hours (from fully discharged). If the voltage was, say, 9.8V before charging then you could probably knock 4-5 hours off that time. Link to comment Share on other sites More sharing options...
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