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Old 03-06-2005, 01:59 PM   #1
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Default Charging NiMH

Hi. I have a pack of GP3300s and have a couple questions too. I tried to find answers elsewhere, but there is so much conflicting info out there...

How many times can I charge these in a day? I've heard everything from NiMH batteries don't care, to only charge them twice a week, so I'm quite confused.

After I charge them, should I give them a period of time to cool down before I use them?

I used to know some guys who would charge their NiCds inside a cooler with icepacks in it to keep the batteries cold so they would take and hold a charge better, is this a good idea with NiMHs?

Do they need to be discharged after use and before charging again like NiCds?

Should I store them with a full charge?

Thanks!
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Old 03-06-2005, 02:32 PM   #2
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Check this: Fukuyama guidelines

That shold answer most of your questions, if not all.

I've been following the Fukuyama guidelines for a year now, nd with very good result. Only exception, is I keep the temperatures sligthly lower, from 50-55 degrees celsius.
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Old 03-06-2005, 03:06 PM   #3
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The sooner you run your packs after a charge the better they will perform. Do not cool your packs while charging the pack should get warm-hot to touch. Most guys store their cells partially charged.After you run them put them in your box but make sure you tray them before the next charge.
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Old 03-06-2005, 11:05 PM   #4
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Ok, thanks. Now that I have that info, back to my first and most important question.

How many times can I charge these in a day?

Thanks
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Old 03-07-2005, 04:11 AM   #5
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Two times should be fine,(is fine actually) but most people, never charge their good packs more than once a day
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Old 03-07-2005, 05:13 AM   #6
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Here is another.

http://www.teamtrinity.com/tips/batts.asp
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Old 03-07-2005, 05:30 AM   #7
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Quote:
Originally posted by Artificial-I
Here is another.

http://www.teamtrinity.com/tips/batts.asp
It seems to me, this apply to the first generation of NiMh cells. I think it tend to be outdated a little
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Old 03-07-2005, 06:31 AM   #8
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Quote:
Originally posted by HVAC25000
Ok, thanks. Now that I have that info, back to my first and most important question.

How many times can I charge these in a day?

Thanks
Charging more than once a day will result in shorter run time for the second charge. This is due to an increase in the cells IR (internal resistance). This also means that you will have less power/punch.

Hope this helps.

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Old 03-07-2005, 06:47 AM   #9
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Quote:
Originally posted by Emil
Charging more than once a day will result in shorter run time for the second charge. This is due to an increase in the cells IR (internal resistance). This also means that you will have less power/punch.

Hope this helps.

Emil
I agree that runtime will be shortend some, but actual the packs are more punchy the second time But remember to let them cool down before the second charge, that is 1-2 hours.
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Old 03-07-2005, 11:38 AM   #10
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Thanks for all the info, everyone!
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