Talk:Nickel–cadmium battery (vented cell type)

Good article
Nominated this for a GA to get more feedback on how to improve it. I think currently its well written, easily verifiable from any battery literature and broad enough in its scope (treatment of each type of cell structure and plate type is welcome but keep it brief). The article is relatively stable and the edits on it have been improving it. There are images which illustrate the subject but even better could be found or easily taken. All in all, I think the article more than fills the criteria of a GA and certainly deserves the status. --Miikka Raninen (talk) 10:17, 5 July 2008 (UTC)

Vented type new to people
Had to add this article since most of the world thinks all NiCd batteries are of the sealed type with all their problems and baggage. --Miikka Raninen 15:37, 9 April 2007 (UTC)

Article Development
The article gives good background on aircraft batteries but could use some additional content to discuss larger vented cells used in standby and rail applications. Another useful addition would be a discussion of different plate types: sintered, pocket, fiber, foam, and plastic-bonded. I can provide the content but am just starting to learn the formatting commands. BatteryGuy 22:41, 31 August 2007 (UTC)


 * Yes, I work in aviation, hence my bias for all things with wings. I'm an 'AvionicsGuy' and recently I had learn more about batteries and found that writing a wikipedia article of them was useful in clarifying my thoughts. I went through SAFT, Marathon and GE literature to find the facts that are currently here.


 * As far as I understand, aviation batteries are of the sintered type although SAFT has come up with some more advanced models lately. The capacities vary between 5Ah to 50Ah for aviation cells, yet they have suprisingly uniform electrical characteristics. Would this hold for even larger cells or different plate types used in train and backup power applications? Cause if they have different cell characteristics, for example different charge voltage limits, then my description of these would only hold for aviation type ones.


 * We can even consider spilitting up aviation type to a separate article if this one grows too large since I have the keyword aircraft_battery directed here and I can replace that with an article dealing with only them.


 * Looking forward to working with you.


 * --Miikka Raninen 09:04, 24 October 2007 (UTC)

Made some small edits for a start. I need to add content at the beginning of the 'structure' part to discuss the different plate types - sintered, pocket, fiber, plastic-bonded. It will take a little time to gather pictures for this. More soon! — BatteryGuy 23:53, 26 October 2007 (UTC)

Explanation required
User:216.113.24.1 added the following: "One should be very carefull not to charge a NiCd battery with Constant Voltage when it is coming back from a very low state as this opens the door to reverse polarity that can destroy an affected cell."

This sounds very strange to me. Reverse polarity is something that occurs when you discharge cells, not while charging. And a Constant Voltage charge is typically essentially a Constant Current charge at first when charging an empty battery since the powersupply/charging cables limit the current at first. At least aviation NiCd batteries can be charged with initial currents of up to 10CA with no harm done until battery starts to reach full charge. And language like "opens the door to reverse polarity" is in itself bad since it doens't explain anything, even if there exists? some fact supporting such behaviour. This article, unlike the normal NiCd article is very much based on facts from several manufacturer's manuals and general battery chemistry literature. Lets keep the anecdotes elsewhere... --Miikka Raninen (talk) 20:26, 28 February 2008 (UTC)


 * OK, removed this claim as I found no reference to such from battery literature. --Miikka Raninen (talk) 23:29, 19 March 2008 (UTC)

Define CA
I'm sure I'm not the only one that doesn't recognise the unit CA. Coulomb Amps doesn't seem to make sense as a unit. Please either spell out the words the first time it's mentionned or link to a wikipedia page explaining it.

The article on battery charger doesn't mention this at all. It defines C as "This is often denoted as C and signifies a charge or discharge rate equal to the capacity of a battery divided by 1 hour. For example C for a 1600 mAh battery would be 1600 mA (or 1.6 amps)." Is this the same unit? If so, perhaps these articles should be brought into alignment. Yyattt (talk) 08:17, 6 August 2009 (UTC)

Construction
It would be nice if someone could say which terminal (positive, negative) is connected to which material (Ni, Cd) I'm also getting a bit confused with the terms "anode" and "cathode": I suspect that they could mean different polarity depending on whether you view the battery as a power source from the outside, or look at the charging process inside... --BjKa (talk) 14:08, 23 July 2012 (UTC)