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    command NTG 4 update..charge battery?

    Just about to update my NTG 4 in my 2011 c-class with 2014/15 maps...Have seen it takes the best part of 2 hours to complete. Question is...Is it safe to connect my RAC battery charger to the car battery whilst the update is running with the ignition of the car on, i plan to use it in trickle...
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