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Old 07-30-2009, 10:22 PM   #1
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Post Battery Charging questions

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First off.. I have been lurking here for a little while and this is my first post. I have found the information here really useful but I guess I need some clarification.

I have recently gone Lipo for my Slash. I needed a Lipo charger so I bought one that can do all batteries and balance. I sold my easy Dynamite Nimh charger for the eXtreme x-605 (same as the Turnigy Accucel-6). The manual is.. well translated. And it might be the heat but I just don't feel I am grasping this yet.

Lipo Question:
- What settings Amps/Volts do I set the charger to charge a my 20-30C 2200 3cell 11.1V?

Nimh Question:
- What settings (A) to charge my 7cell 7.2v packs? (Slash)
- What settings (A) to charge my 6cell 7.2v mini pack (1100 mah for 18R)

Thank you in advance for any help.

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Old 07-31-2009, 12:19 AM   #2
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Re: Battery Charging questions

For lipos you should only get choices like 2S (7.4v), 3S (11.1v).. etc. You should be charging at 2.2amps.

To get the charging current just divide the capacity by 1000. So for the 1100mah mini pack it would be 1.1amps.

You should always do a forming charge on nimh batteries at 1/10C which would be capacity divided by 10,000 (yes that is 0.11 amps for the mini)
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Old 07-31-2009, 12:31 AM   #3
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Re: Battery Charging questions

Originally Posted by waylander View Post
To get the charging current just divide the capacity by 1000.
divide capacity by one hour
(2200mA = 2.2A no division necessary)
the rest is correct
2.2A for a 2.2Ah pack

make sure your batteries don't get hot
(seven cell packs will be 8.4 Volts)

rule of thumb:
Charge as slow as you can afford to, your packs will last longer
desiderantes meliorem patriam
To err is human, to moo is bovine

Last edited by moo; 07-31-2009 at 12:37 AM.
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Old 07-31-2009, 03:37 AM   #4
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Wow. Thanks for the info. I knew it wasn't too diffucult.. I did charge the mini nimh for 2 hours at .5A. Never got hot but very slightly warm.

I will charge the lipos tomorrow and see how far the Slash will fly.

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Old 07-31-2009, 08:24 AM   #5
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Re: Battery Charging questions

Something else that is very important .. never let your lipo batteries drop below 3.0 volts per cell .. ie: 9 volts for a 3S lipo. You must actually look at the voltage of each cell as even at 9 volts one of the cells could be dangerously low if the cells are out of balance.
If a lipo cell gets drained too low it will never charge again !
Also to get maximum performance you must balance charge the cells .. this is particularly important in electric cars and trucks that draw a lot of current from the battery ..
Lipos can provide very large currents for their size, but they need a little more TLC compared to NiCd and NiMh batteries.
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