Yep, battery charger connected is the best plan to stop it getting drained.
Doing the firmware updates depends how many are required (I haven't checked exactly but there's a fair few!) and maps is about 2.5-3 hours.
When the maps are running I just check on it every half an hour or so till I know it's nearly done
Instructions are here, for background info:
https://mega.nz/#!EBcGUbwD!Pc5vB2zZ0...gIrodB20rLmFXY
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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