Sat Nav update keeps 'sleeping'

[Ken Figenus]

Loading 5 yr more recent maps via DVD to the under reasr seat HDD unit. Have the trickle charger connected in the boot and a 6A charger connected at engine +ve point but the b car keeps switching sat nav off and going into low power battery save mode.

Nothing else is on like fan blower or ICE - any tips guys?

I think its a Volvo MMM+ system - but that by now is opinion rather than fact

Thanks

[Ken Figenus]

Thanks John - think I was getting about 15 mins before battery save mode despite the 2 chargers being hooked up. Have a drive to London today to sort! Cheers.