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Old Jan 10, 2015, 02:24 PM
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fATAL's Avatar
United States, GA, Augusta
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Question
Charging

So its okay to charge a 5000 mAh battery @ 4amps correct safe is 5 amps so 4 is safe or will it be a negative impact to battery life.
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Old Jan 10, 2015, 02:40 PM
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why would it have a negative impact to charge at a lower rate than 1C?
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Old Jan 10, 2015, 02:51 PM
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It shouldn't but i was asking to be sure.
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Old Jan 10, 2015, 03:13 PM
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It's OK to charge slower.
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Old Jan 10, 2015, 03:23 PM
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Originally Posted by fATAL View Post
It shouldn't but i was asking to be sure.
i see. someone had posted on another thread about higher charging rates affecting lipo life (which is also not true), so i was trying to ascertain the source of their information. you did not read this somewhere, right?
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Old Jan 10, 2015, 03:27 PM
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Originally Posted by cmdl View Post
i see. someone had posted on another thread about higher charging rates affecting lipo life (which is also not true), so i was trying to ascertain the source of their information. you did not read this somewhere, right?
I think I read similiar posts about the risk of fires when charging over 5 A on 5000 mAhs.

That isnt true?

Is there a voltage limit to lipos what if i wanted to charge 24V @ 5A
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Old Jan 10, 2015, 03:35 PM
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no risk with charging at higher than 5A. read: http://www.rcgroups.com/forums/showthread.php?t=1754232
in particular, read what everydayflyer posted in that thread.
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Old Jan 10, 2015, 03:44 PM
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Originally Posted by fATAL View Post
I think I read similiar posts about the risk of fires when charging over 5 A on 5000 mAhs.
I know folks who charge their 5000mAh lipolys at 40A. They'd go higher but that's the limit of their chargers. Some 5000mAh lipolys are rated to be charged as high as 60A: http://www.thunderpowerrc.com/Produc.../TP5000-6SPF70
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Old Jan 10, 2015, 03:51 PM
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Originally Posted by fATAL View Post
I think I read similiar posts about the risk of fires when charging over 5 A on 5000 mAhs.

That isnt true?

Is there a voltage limit to lipos what if i wanted to charge 24V @ 5A
Yes there is a voltage limit. Lipo cells are never charged at more than 4.2v per cell. So a 6s would have a max charge voltage of 25.2 volts. Use that voltage on a 3s battery and you have a fire.
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Old Jan 10, 2015, 03:54 PM
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Originally Posted by fATAL View Post
I think I read similiar posts about the risk of fires when charging over 5 A on 5000 mAhs.

That isnt true?

If a reliable charger is used virtually any battery can be charged at 2C, even 3C.

Is there a voltage limit to lipos what if i wanted to charge 24V @ 5A
The voltage you charge at is dependent on the number of cells in the battery pack.

1S = 4.2V
2S = 8.4V
3S = 12.6V
4S = 16.8V
5S = 21V
6S = 25.2V
7S = 29.4V
8S = 33.6V

The charge current is dependent on the rating of the individual pack. Usually indicated by the mah of the pack. So a 5000mah pack can be charged at 5A. A 1S 5000mah can be charged at 5A. A 8S 5000mah can be charged at 5A.

Of course the limitation is determined by the power and specifications of the charger.

BTW a little punctuation would make your questions a bit more readable.

Glen
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