Hi all, In my job I often use lead acid batteries (sealed, usually with glass mat type construction) and often end up guessing when it comes to issues like: how long will this battery last (in terms of service life) when charged/discharged this way, how does the open circuit voltage relate to state of charge, etc. Has anyone found a good book which explains all of this in detail? I'm not afraid of a little chemistry and math, either. Most of what I've found doesn't address these type of deeper questions but assumes that your application neatly fits some common category. Thanks, Sean -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist