Talk:Memory effect

message: * I am a little confused, but I don't pretend to know that much about the topic. The current articles says:
"Voltage depression does not occur in nickel hydride (NiMH) batteries"
and then in the same paragraph
"voltage depresssion in general is just as common (in NiMH batteries) as with NiCd"
Am I being stupid, or is there a contradiction here? Tompagenet 11:57 Apr 10, 2003 (UTC)
Ditto.
Thadk 9:23, 2004 Jan 10, 2004 (UTC)
Taken from main page since it is clear that it contradicts itself and
nobody seems to be able to fix it:
AdamW Jan 15, 2004 
Voltage depression does not occur in nickel metal hydride (NiMH) batteries because the electrolyte does not crystalize, which is why these types of batteries have become increasingly in demand for most electronics that are repeatedly charged, like laptop computers and cell phones. Most advertising for NiMH batteries includes the claim that they are immune to the memory effect, although cell degradation and voltage depression in general are just as common as with NiCd.
Is the memory effect not a special case of hysteresis?
: The "battery memory effect" is different than the "passive matrix memory effect" that hysteresis mentions. Should we just mention the other effect in the article, or do we need a different article with disambig ? --DavidCary 01:08, 3 Apr 2005 (UTC)
thread_title: Untitled

message: Can someone actually clarify what the memory effect is? I got the vague impression that it refers to an unwanted lower charging voltage for rechargeable batteries under certain circumstances ????
:I didn't understand the original meaning either, but what I understood was that overcharging the battery leads to "clogging" of sorts, making the battery appear to discharge very fast - the voltage drops rapidly. However the drop is not caused by running out of power but simply increased resistance. 65.95.157.80 23:03, 6 October 2006 (UTC)
thread_title:  What Exactly Is The "Memory Effect"? 

message: Well, is this the same as a mechanical spring losing its bounce when compressed pr stretched too far or to a lesser extent for too long? such as clapped-out mattresses etc? Wilsonsamm (talk) 21:30, 5 June 2009 (UTC)
thread_title:  memory effect in mechanical springs 

message: When the batteries are frozen this will reset the memory effect. 
I took out this sentence, as it is ... just wrong.  In order to "reset the memory effect," you'd need to reset the chemistry of the battery.
153.42.226.100 01:26, 13 December 2006 (UTC)
thread_title:  Frozen batteries 

message: As a one-time battery chemist I picked up some information on NiCd and NiMH battery misbehavior.  Memory effect, as observed in satellites, can be reversed by deep dicharging the cell to below 1 volt and then recharging as normal. Voltage depression is usually caused by growth of large crystals of the active materials on the electrodes.  When current is drawn, the cell cannot sustain normal currents because the surface area of the active material of the anode or cathode is smaller than normal.  This large crystal size is often a result of extended trickle charging (C/10) common with cordless phones and other devices that have inexpensive charging circuits.  Again a deep discharge then recharge can rejuvenate the battery.  You may need to repeat this.  The higher the charge rate the smaller the crystals and the higher the surface area of the electrode.  The best solution to this problem is a sophisticated charging circuit in the device.72.85.166.20 16:56, 28 April 2007 (UTC)
thread_title:  Memory Effect and Voltage Depression 

message: I just cleaned up the article, someone put the following sentence into the article, so I've moved it here--
"(This section needs updating.  Information supporting this fix is available in the Gates manual.  Also, voltage depression is caused by an alternate chemical reaction, not crystals.  The part about cell reversal is true.)"
Don't know if anyone can get anything out of this Binliner4 18:08, 25 September 2007 (UTC)
thread_title:  Voltage depression and chemical reactions

message: I've noted on several occasions that my sonicare toothbrush goes from holding a charge for several brushings to holding enough for only 1 or 2 after I travel somewhere with my toothbrush in my checked baggage.  This has happened when travelling through SeaTac Airport in Seattle.  Does anyone know if there is an impact from the new TSA baggage screening devices on NiCD batteries?  —Preceding unsigned comment added by 156.74.250.7 (talk) 21:35, 27 February 2008 (UTC)
thread_title:  Impact of Airport Baggage Screening on NiCDs 

message: "Zapping" is not mentioned. Electrodes that are isolated by cystals/oxide might be repaired by zapping a battery or single cell. This is applying a relative high voltage on the battery. For example 1.5V cells can be zapped with 30-50V until they start to respond ( by current.. ). There is also some similar method for led-batteries ( in cars ) using mains voltage.
83.250.171.59 (talk) 21:32, 3 November 2016 (UTC)
thread_title:  Repair