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2300mah Charging Question?

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2300mah Charging Question?

Old 03-13-2005, 09:47 PM
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vldoubleu
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Default 2300mah Charging Question?

I have a Sanyo 4.8V Ni-Mh 2300mah 4 cell receiver battery pack for my Raptor 50V2 Heli. I also have a Prophet Plus LCD AC/DC Peak Charger and wanted to find out how many volts I should be charging it at? I really don't understand the whole charging process so if someone could break it down for me in idiot terms, I won't take it personal. I don't want to charge it too fast and damage it so I thought I'd ask for help. Any and all assistance would be appreciated. Thanks!
Old 03-13-2005, 11:00 PM
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ChopperMike
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Default RE: 2300mah Charging Question?

You don't set the voltage when charging, you set the charge current. NiMH batteries should be charged at no more than 2C, which means 2 X the capacity of the battery. This is assuming that the battery is rated for a high current charge, some aren't, but the highest available cells would be 2C. In your case this would be 4.6 Amps. If these are sub C cells they should be able to handle 2C. I generally don't charge my RX packs that high, 1C will bring them up from totally discharged in an hour. If you can wait it's best to charge them at a lower rate, it's better for the battery.

I'm not familiar with that charger. Is it rated for charging NiMH? They are a little different than NiCad.


Mike
Old 03-14-2005, 10:47 AM
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rusirius
 
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Default RE: 2300mah Charging Question?

I replied to your post in the other forum... What Mike says is absolutely true for normal NiMH packs... Though generally nicd's are best at 2C and nimh best a 1C... However, the 2300mah packs are very special due to their very high internal impedance and extremely thin internal walls... Check the other post for more specific info, but if you charge that pack at 2C, or even 1C you'll destroy it...
Old 03-14-2005, 12:28 PM
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FLYBOY
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Default RE: 2300mah Charging Question?

vldoubleu, I see your new, but just wanted to point out so you know. Only ask your questions in one forum. It is against policy to spam the question into more than one forum.

Thanks
Old 03-14-2005, 02:23 PM
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ChopperMike
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Default RE: 2300mah Charging Question?

According to the Sanyo web site this pack can be fast charged at 2300mA or 1C. As I said the general rule for never to exceed charge rate is:

NiCad - 3C
NiMH - 2C
Lithium - 1C

This of course depends on whether the particular cell you have can handle it, check with the OEM. Also, if the battery is excessively warm, let it cool first. Even if it's capable of the charge current you're using, it's not a good idea to charge a hot pack. It's also not a good idea to take a hot, recently charged pack and immediately put it in your model.


Mike

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