Alastair,
when you say they are reading a ‘little low’, how low is low?
A reading of 12.7 – 12.9 volts would be acceptable for new batteries, and if they were dry charged and the electrolite added just before you purchased, the lower reading could be normal until they had cycled a few times.
If when fully charged the voltage increases a lot (0.2 volts +) when you take a reading from just one battery, perhaps there is a current draw or earth leakage on the other, which may account for a different reading when using a handheld meter.
rgs
Paul
