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reviving old nicads. - 12/30/2012 10:51 PM   
Keith 65


 

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From: lancing, UNITED KINGDOM
Status: offline 		hi.

am trying to revive my old reciever nicads all are 4.8v and 1100 amh. have tried a long slow charge first followed by quick charge and discharge.

question is at what point are they no good.

i takes 1100 mah of charge but only puts back out 900 on discharge
another will take 900 mah of charge but gives back only 700 mah.

what should they take in reality of amps and what should they on average put out when being discharged.

rates are .500mah on charge and .500mah on discharge.

or do i just bin the lot and start again with new.. trouble is i have a few models and was hoping to save a few if they was any good, but wont rist the models if they are scrap. but an idear of how to gauge the usefullness of them would be good .. even if just to test others in the future and know when its time to replace.

keith

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RE: reviving old nicads. - 12/30/2012 11:15 PM   
Goldenduff


 

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From: Aberdeen, UNITED KINGDOM
Status: offline 		Most say less than 80% mah is dead. Is it worth the risk for the cost?!...

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RE: reviving old nicads. - 12/31/2012 12:20 PM   
Keith 65


 

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From: lancing, UNITED KINGDOM
Status: offline 		i have decided to bin the lot and start a fresh,, as you say its not worth the risk.

am now pondering on what to do now for replacements as there seems to be quite a choice on the market,

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RE: reviving old nicads. - 12/31/2012 12:24 PM   
Rodney



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From: FL
Status: offline 		Nixx batteries will always need much more input than they will output as the charging chemistry is only about 80% efficient. What is the rating of the batteries? If the output is less than 80% of the rated value, they are on the way out. Also check for excessive self discharge as the older batteries will sometimes self discharge at a very high rate. If it is more than 5% in 24 hours, I'd junk them.

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RE: reviving old nicads. - 12/31/2012 1:11 PM   
Goldenduff


 

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Status: offline 		Life have very long shelf life and similar voltage to some nicd packs

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RE: reviving old nicads. - 12/31/2012 7:44 PM   
countilaw



Posts: 802
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From: Grand Prairie, TX, USA
Status: offline 		Check out   Venom  Batteries,    they cost a little more but they have a great  warrantee.       http://www.venom-group.com/

Their  Venom Pro Plus is a great charger.   It's a ac/dc (comes with a power supply) plus comes with all the connectors to fit all the popular batteries.   One thing I like about it is that it will   cycle your batteries 4 times without you having to attend to it.    The digital display also lets you know what's going on with your batteries.    And it cost  under  $100.00


Frank 



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RE: reviving old nicads. - 12/31/2012 9:38 PM   
JPMacG


 

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From: Ivyland, PA, USA
Status: offline 		My experience with the 1100 mAh AA sized NiCd cells is not good. They seem to lose capacity after only 2 or 3 years. In contrast, the 600 (or 700) mAh AA sized NiCds retain their capacity for 7 to 10 years.

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RE: reviving old nicads. - 12/31/2012 9:41 PM   
JPMacG


 

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From: Ivyland, PA, USA
Status: offline 		By the way, it is normal to have to put in more mAh than the capacity of the pack. It should take about 1300 mAh to fully charge an 1100 mAh pack.

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RE: reviving old nicads. - 12/31/2012 11:33 PM   
pilotpete2



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From: Lyndonville, VT, USA
Status: offline 		My last Nicds were the Sanyo 100mAh AA nicds. My experience was exactly the same.
A 2S 1100mAh A123 pack is a great upgrade, as long as all your servos are rated for 5 cell operation (6V), and you have a charger that supports A123/LiFe batteries.
If you need to stay with a 4.8V 4 cell setup, then a pack made with 1650mAh Sanyo Nimh are a good choice. Some will recommend Eneloops, but their internal resistance is a bit high for receiver packs, for transmitter use they're a no brainer though.
Pete


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RE: reviving old nicads. - 1/1/2013 1:21 PM   
Keith 65


 

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From: lancing, UNITED KINGDOM
Status: offline 		having checked the servo volt range i'll have to stick with the 4.8 size for now, 148's and 303's ...bigest plane im running is a 120 size p40 so for these im looking for massive power draws at the moment,, just reliability and max flight times i can get, i do have a field quick charger and a loaded volt checker , so am able to give the batteries a check and a quick boos if they are getting a bit low,

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RE: reviving old nicads. - 1/13/2013 10:41 PM   
jetmaven


 

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From: plant city, FL, USA
Status: offline 		Whatever you decide , remember to recycle nicads

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RE: reviving old nicads. - 1/16/2013 11:43 PM   
eddieC



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From: Jackson, MI, USA
Status: online 		One caution about Nimh is they fail open - if one cell fails, the pack goes to 0.0 volts. Nicads fail closed so with a 5-cell pack, if one cell fails you still have a 4-cell pack.

< Message edited by eddieC -- 1/17/2013 7:53 PM >

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RE: reviving old nicads. - 1/17/2013 3:02 PM   
Four Stroker


 

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From: , GA, USA
Status: offline 		I agonized over what to do with old radio stuff. I decided to go with A123 packs and a low drop out (LDO) LINEAR voltage regulator. In my case a Fromeco Sahara. The advantage is that there is a small fraction of a volt drop (maybe 0.05 volts) when and if the RX pack dumps. The Sahara is good for 40 A or so - big heat sink. A switching regulator can reduce your range significantly - and I mean on 2.4 GHz. They can also go nuts and trip your battery failsafe. You could also use a 5 cell NiCD/MH pack with a Sahara. If one cell fails, you still get 4.8 volts out. Some regulators lose 1.5~2 volts in normal operation.

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