Hello, I found this on ebay. Has anyone tried building a BMS for lead-acid? http://www.ebay.ca/itm/20-pcs-x-EG4318-lead-acid-battery-charger-management-chip-/251386232401?pt=LH_DefaultDomain_0&hash=item3a87c97e51#shpCntId Any advice/diagram/other thoughts? Thanks, John in Denmark