At 10:19 AM 4/30/2011, Sean Breheny wrote: >Why do you say that lead acid does not have a "current then voltage" >charging cycle? In my experience, it is quite typical for chargers to >apply their maximum current until the lead acid battery reaches some >voltage threshold, and then that voltage threshold is held until >charge is complete. Better chargers will temperature compensate that >CV (constant voltage) setpoint, but still, the overall charge is >CC-CV, which is quite similar to what you do with Lithium chemistries. Flooded Lead-Acid can accept astonishingly-high charge currents=20 without being damaged or destroyed. Most people don't need to charge=20 that quickly, so they use a much smaller charger that is then run in=20 constant-current mode until the battery terminal voltage reaches the=20 appropriate threshold. In other words, the reason the charger runs in constant-current mode=20 is simply because of the limits of the charger. A real-world example of rapid Lead-Acid charging occurs in=20 practically every internal-combustion engine automobile on the=20 planet. The alternator dumps as much current into the battery as it=20 can - on large trucks, that can be upwards of 100A. The battery=20 doesn't complain at all. dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .