The OP will have 2 x 55w headlights on the model they have so will be 204w total (without ECU, coils, instruments, heated grips or any other accessories)
The DL650 has a YTX12-BS battery, 10.5Ah
The DL1000 has a YTX14-BS 12.6Ah
Seriously, I worked in a dealers, we PDI'd new bikes and they all had a slight dimming on the rear running light when the indicators/hazards were on.
That's a brand new bike with brand new battery I had just filled.
That's regardless of make unless it was a can-bus system like Ducati and BMW.