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Try MD-Techs BMS
MD-Tech were supplying kits to Enginer but are now designing and selling their own, vehicle certified kits in Europe. Take a look at MD-Tech's latest BMS see plughybrid.de Their BMS keeps the cells within a 10mV range and has a measuring accuracy of 2mV. That's pretty tight. After 6 months since the European launch kits are running well and batteries are balanced.
Balancing is triggered if the High cell is 10mV higher than the Low cell. An internal clock checks every 15 days if balancing is needed then runs balancing for 24 hours. It can be forced to stay on with a switch on the side. It has been used on old Enginer battery packs to good effect, getting the packs balanced and keeping it that way.
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