answer seems to be to measure using a chip with a one wire protocol and then isolate that digital signal
this is possibly the answer
http://datasheets.maxim-ic.com/en/ds/DS2436.pdf
and here is a document as to how to implement it
http://www.drgw.net/workshop/solarcar/solarcar.html
individual links
http://www.drgw.net/workshop/solarcar/documents/components/battmon-desc.pdf
and most useful - the schematics
http://www.drgw.net/workshop/solarcar/documents/components/battmon-schem.pdf
and a description of the packets
http://www.drgw.net/workshop/solarcar/documents/components/battmon-pkt.pdf
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