Have your seen this product sold on Amazon? It plugs into the cigarette lighter socket and gives immediate reading of battery condition with engine not running/or running.
www.amazon.co.uk/Vehicle-Battery-Voltage-Monitor-Checker/dp/B007FW9HFK/ref=cm_cr_arp_d_product_top?ie=UTF8
I received mine after about 3 weeks wait from China and plugged it into my car yesterday and turned on the ignition and the reading was a low 11.6v which I thought was a bit odd for a new-ish car. On starting the engine of course it rose to nearer 14v. Hmmmm.
Will have to get out my 'proper' AVO meter and check voltage directly across the battery terminals
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Volkswagen - 16 1.4 Measuring battery con.. new
Volkswagen - 16 1.4 Measuring battery con.. new