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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Charging 1800 ma battery
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Charging 1800 ma battery - 5/21/2006 10:35:21 PM   
Zero



Posts: 39
Joined: 10/22/2002
From: Houston, TX, USA
Status: offline 		I have an 1800mah battery pack and would like to know if anyone can help with the charging of it. I currently have a Digipace I which has 50 and 120 ma charging and also the Trickle charge upgrade. I understand the C/10 would = a charge rate of 180ma on an overnight charge. Will my Digipace set at a charge rate of 120 ma charge my 1800 mah battery to its full capacity? If so how many hours would it take. I have my original Digipace manual however it is hard for me to understand. Thanks
       Post #: 1

RE: Charging 1800 ma battery - 5/22/2006 12:17:20 AM   
guver


 

Posts: 8975
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: online 		It will do the job in about 24 hrs or so if the batt is dead. Hopefully the voltage and such is within specs also.

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RE: Charging 1800 ma battery - 5/22/2006 12:26:45 AM   
Zero



Posts: 39
Joined: 10/22/2002
From: Houston, TX, USA
Status: offline 		Thanks for the info. Battery is new. Could you shed some light as to calculating the number of hours?
Thanks again.

(in reply to guver)
       Post #: 3

RE: Charging 1800 ma battery - 5/22/2006 12:37:40 AM   
Red Scholefield



Posts: 4980
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: Zero

Thanks for the info. Battery is new. Could you shed some light as to calculating the number of hours?
Thanks again.


We use 140% input for a fully discharged pack and this gives lots of safety factor. In reality for a good pack you can input 120% for one that is fully discharged, at least as fully as we do in flying them.

Then it follows that 1800 mAh times 1.2 = 2160 mAh requried. Divide this by your charge rate 2160/120 and you come up with 18 hours.


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Red S.
AMA 951 Leader Member

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RE: Charging 1800 ma battery - 5/22/2006 4:26:27 AM   
Zero



Posts: 39
Joined: 10/22/2002
From: Houston, TX, USA
Status: offline 		Thanks Red.
Fred

(in reply to Red Scholefield)
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RE: Charging 1800 ma battery - 5/22/2006 5:30:54 AM   
john68


 

Posts: 252
Joined: 1/20/2006
From: Burgettstown, PA, USA
Status: offline 		Red, does that mean that I would have to charge my 1800 mAh pack for 43 hours, with a 50 mAh charger?

Thanks,
John

(in reply to Zero)
       Post #: 6

RE: Charging 1800 ma battery - 5/22/2006 4:15:11 PM   
guver


 

Posts: 8975
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: online 		As the ratio goes down, the multiplier percentage has to go up. That's why I came up with 24 hrs. I had thrown some type of formula together a while back, but never got any input or criticism about it. Maybe Red has a formula.

According to my calc and formula it will take over 60 hrs, Red know possibly if there's a rate that can be left on forever,,,, like a c/60 or c/100 something like that.

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       Post #: 7

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