Battery Charging

[Dave Abrahamson]

Does anyone know the formula for figuring out charge time for NiCd batteries?<br />For example; 9.6volt 250MaH wall charger to charge a 9.6volt 900MaH battery pack. <br />Thanks <br /><br />Dave<br /><br />(edit) Nevermind, I found it.<br />Just as an FYI;<br /><br />Every Battery Charger has a "Out-Put Current Rate" and a "In-Put Current Rate." This information should be printed some where on the charger. To figuire the time it will take to charge your batteries ...Take the Capacity of the battery and divide by the Out-put rate.This simple formula will give you the answer.<br /><br />Example...Out-Put Rate on Charger is 500 mAh<br /> Battery is rated at 2300 mah......<br /> Divid 2300 by 500=a charge time of 4.6 hours.<br /><br />Or........Out-Put Rate on Charger is 300 mAh<br /> Battery is rated at 1800 mAh......<br /> Divid 1800 by 300=a charge time of 6 hours

 

[Paul Moir]

Re: Battery Charging

Time (hours) = (Battery MaH X 1.4) / Charger MaH<br /><br />So in your example:<br />Time = (900 x 1.4) / 250<br />Time = 1260 / 250<br />Time = 5 hours.<br /><br />Hope that explains it!<br /><br />EDIT: Ah, yes but that doesn't account for any charging inefficiency. Which NiCads do exhibit. The 1.4 corrects for that.

 

[Dave Abrahamson]

Re: Battery Charging

Thanks Paul,<br />I must have edited at the same time you posted.<br />I just cut and pasted the info from a site on the web.<br /><br />Dave