Help restoring Capacity Nicd (Full Version)

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jeeprubicon2k3 -> Help restoring Capacity Nicd (4/8/2008 12:10:40 AM)

Hi, I just got a 8c 1100mah nicd pack that I have no idea how old is or anything. I threw it on my charger @ .5amps with a delta of 8mvpc and got around 750mah in. The pack was still 23c so I bumpped the delta up to 9mv then 10mv. Do I just keep going until I get a warm peaked pack? Then I should cycle it down to .9vpc and repeat right?

Its not a critical pack just a beater.



SavageX78 -> RE: Help restoring Capacity Nicd (4/8/2008 12:36:42 AM)

I would just start cycling now. Then youll know what it will hold. There could have been some charge still left in it when you got it.

Also you may want to discharge @ .2 and charge at .2 At least for the cycling. that should help yopu get the most you can for your bashing needs.



jeeprubicon2k3 -> RE: Help restoring Capacity Nicd (4/8/2008 12:39:41 AM)

I started with a .9vpc discharge @1amps. Will it be more accurate to do it slower. What about the delta peak? Should keep bumping it up till it peaks warm?



JPMacG -> RE: Help restoring Capacity Nicd (4/8/2008 3:45:00 AM)

I'd charge it at C/10 for 24 hours the first time. Then cycle and see what you get. After that, go ahead and use your delta peak if you must.



richrd -> RE: Help restoring Capacity Nicd (4/8/2008 6:22:52 PM)

False Peaks may be an indication of a pack going bad. On my ICE if i fast charge some 3 year old packs "Black& Decker" they go nuts on the graft looks like bubbles popping. But on C/10 all is fine and i can use the packs for the day but the self discharge is high. On some old basher bat's i worked on will not peak charge at all the voltage drops before 100mAH can be put in again disable peak an charge slow if can not be watched. If cycled they do get better for a while if continued use.
Rich



jeeprubicon2k3 -> RE: Help restoring Capacity Nicd (5/6/2008 4:11:19 AM)

I have got the delta peak up to .12mvp and the current @ .6a, pack is barely above ambient temp at peak. Should I bump up the DP or the current? Any advice to using this old pack? The mah has gone up some.



richrd -> RE: Help restoring Capacity Nicd (5/6/2008 1:24:43 PM)

You are missing the point Delta peak detection only works well at 80% of max of 1 C. or up to 1C...Old packs can only be slow charged at C/10 1100MAh or 100ma for 16 hours. It may never work right again if it is old and has lots of salt deposits. If you can not slow charge with no peak detection or cycle test for capacity then only choice is continue to play with it. BUT! be warned if you up the peak detection an charger miss peak you will out gass that battery with bad results.
Rich



Rodney -> RE: Help restoring Capacity Nicd (5/6/2008 9:08:39 PM)

For NiCads that have been idle for a long time (or new and never used) charge at 0.1C for 16 hours. Discharge down to 1.1 v/cell at a rate not higher than 0.25C and charge again at 0.1C for 16 hours. Now, check capacity by measuring the mah in the pack by discharging at not greater than 0.25C. It may take 3 to 5 cycles of this to bring the battery back up to as high as it is now capable (it may not be salvageable). NASA recommends that, for storage of NiCads, you discharge the pack down to 1.1 v/cell then individually discharge each cell to zero by shunting them with a low impedance (around 1 ohm) then put a dead short across each cell and leave it there while it is in storage. Store at a low temperature with a desiccant and then when ready to use, do the 16 hour charge at 0.1C again prior to use. You can get a lot of information, some of it conflicting, by Googling "NiCad care".



jeeprubicon2k3 -> RE: Help restoring Capacity Nicd (5/7/2008 4:56:08 AM)


quote:

ORIGINAL: richrd

Delta peak detection only works well at 80% of max of 1 C. or up to 1C...Old packs can only be slow charged at C/10 1100MAh or 100ma for 16 hours.


I did not know that Thanks!



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