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07-09-2008 08:09 PM  9 years agoPost 1
maveric4

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england

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This might sound like a real daft question but do you have to format NiMh cells By charging them.
I have been told this is neccessary when they are new to teach the battery its a battery.
The Cells will be Sub C size.
If so how many times would it need.

Your advice will be much appreciated on this one.

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07-09-2008 08:12 PM  9 years agoPost 2
AirWolfRC

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42½ N, 83½ W

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It's called a "forming" charge.
It should be done on new NiCd & NiMeHd.
That simply means a C/20 charge for about 24 hours.

Fast charging a new battery will not bring the pack to full capacity.

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07-09-2008 08:23 PM  9 years agoPost 3
maveric4

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england

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Thanks AirWolfRc,

Not sure what a C20 is for sure but for a 4300mah pack would that be 430mah for 24 hours.

Is this only neccessary for the first charge.
After this is it ok to fast charge before going flying.

Many thanks

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07-09-2008 08:30 PM  9 years agoPost 4
Topher

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Rochester, Michigan

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It would be 215ma for the first charge. Basically just a trickle charge. I have heard this is more important for NiCds than NiMH.

will wash your heli for a quarter

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07-09-2008 08:43 PM  9 years agoPost 5
artimus

rrKey Veteran

Buckley WA

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Isnt this done at the factory? Hence, the slight charge when you get them?

Fly Hard......Team Viagra

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07-09-2008 09:11 PM  9 years agoPost 6
Rob_T

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..

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Experience with NiMH batteries shows you may need to cycle 3 or 4 times using a trickle charge as described above before you can get the batteries to fast charge using a peak detecting charger. Brand new NiMHs tend to be quite prone to "false peaking" otherwise, which can lead to you taking off thinking you have a full battery when in fact the battery is virtually empty!

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07-09-2008 09:11 PM  9 years agoPost 7
AirWolfRC

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42½ N, 83½ W

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Isnt this done at the factory? Hence, the slight charge when you get them?
The factory does not do any charging of new batteries.
The charge you see on new cells is partial and the result of the state of the chemicals used in the manufacture of the cells.

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07-09-2008 09:23 PM  9 years agoPost 8
JuanRodriguez

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The Villages,​Florida

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Isnt this done at the factory?
I read somewhere a while back that manufactures "cycle" the batteries to determine what "group" they will be placed in to determine the capacity rating on the label that ultimately gets put on the cells....

For example, if a NiCad charges and discharges between 1200-1300 for a given number of cycles, then it gets tossed into the say, "1200" bin..... Same process for the 1400 cells, 1800 cells, etc......

In other words, Sanyo does not say, "Today we're going to make 1200 MHA cells and next week we're going to make 1800 MHA cells...." They are "grouped" according on how they actually perform during their testing....

Anyhow, I may have read this on Red Scholefield's "Battery Clinic" site of maybe a link from his site.....

Anyone else read about this (or have any specific knowledge about this) ??

PS-- I know that Lipos get shipped with a 50 % charge but don't know how the NiCads or NiMH batteries are shipped....... the latter do self discharge over time.....(NiCad's self discharge at about 1-2% each day)

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07-09-2008 09:41 PM  9 years agoPost 9
artimus

rrKey Veteran

Buckley WA

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Batterys are a strange to me ...I can see how an engine works.
This battery Charging/ Discharging VooDoo is a dark art indeed...

Fly Hard......Team Viagra

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07-09-2008 09:53 PM  9 years agoPost 10
Topher

rrVeteran

Rochester, Michigan

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I read somewhere a while back that manufactures "cycle" the batteries to determine what "group" they will be placed in to determine the capacity rating on the lable that ultimately gets put on the cells....
That depends on the manufacturer, some do some dont.

artimus, pick up a book on electrochemistry.

will wash your heli for a quarter

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07-10-2008 01:40 PM  9 years agoPost 11
JuanRodriguez

rrProfessor

The Villages,​Florida

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Batterys are a strange to me ...I can see how an engine works.
This battery Charging/ Discharging VooDoo is a dark art indeed...
artimus,

Here is a link to Red's site I referred to in the above post......great site with lots of good reading.... also, if you have a specific question, Red answers emails rather quickly.....

http://www.rcbatteryclinic.com/

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