I wasn't saying that there aren't significant differences in charging lead-acid vs Lithium chemistries - simply that the most common means for fast charging lead-acid is also referred to as CC-CV. You really can't lump all of the Lithium-Ion types together when it comes to charge rate. Lithium Iron Phosphate, (for example, A123's cells) are happy with high charge rates even when deeply discharged. Lithium Titanate are also capable of high charge rate from 0% right up until about 90% SOC. Lithium Cobalt or Lithium Manganese Cobalt (if I remember correctly), which are the "traditional" Li-Ion cells, are, I think, mainly what you are talking about. Overcharge in these types will easily cause deposition of metallic Lithium which will then react violently with the electrolyte. Lithium end of charge voltage is critical, but I would say that Lead-Acid charging, if you want maximum life from the batteries, is actually far more complex than Lithium. LA battery life in float service, for example, requires very accurate voltage regulation based on temperature and even battery age to avoid the two extremes of undercharge (which is more than just not being 100% charged - you actually can develop a situation where the potential of one electrode goes up and the other goes down so that the SOC of the limiting electrode is falling while the terminal voltage is staying the same) and excess float current leading to heating and thermal runaway. Even in cycle service, you have to have accurate voltage AND current measurement to properly fully charge lead acid unless you are trickle charging them. Sean On Sun, May 1, 2011 at 6:50 PM, Dwayne Reid wrote: > At 09:17 PM 4/30/2011, Sean Breheny wrote: >>But it seems that the only difference between LA and Lithium Ion in >>what you are saying is which piece of equipment requires that the >>charge current be limited. > > For me, the greatest charging differences between Lead-Acid and > Lithium Ion are: > > 1) extremely accurate voltage required for Lithium-ion: end of charge > voltage is either 4.10V or 4.20V, depending upon which anode the > battery has. =A0L-A is happy with ball-park voltage levels, relatively sp= eaking. > > 2) Lithium-Ion charge current is greatly reduced while battery is > significantly discharged (unlike L-A). > > dwayne > > -- > Dwayne Reid =A0 > Trinity Electronics Systems Ltd =A0 =A0Edmonton, AB, CANADA > (780) 489-3199=A0voice =A0 =A0 =A0 =A0 =A0(780) 487-6397 fax > www.trinity-electronics.com > Custom Electronics Design and Manufacturing > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .