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@GA2G
For that type of bike, I'd suggest the Kryptonite M-18 at the back, and the Krabus VL202 securing the front wheel to railings/bike rack, and to your frame.
The battery creates a new concern for me, and possibly I'd look for an extra long good U-lock that would go through the frame and rear wheel, and also fit around the battery. From memory, I think the Xena XUL310 is longer, but difficult to source, and uber expensive. Consider also the Kryptonite Evolution-4 300mm and the Abus Granit Plus X 54 300mm as other longer versions.
So another solution would be: Abus Granit Plus X 54 300mm, at the rear, Kryptonite M18 at the front, and a disk alarm through the chainring. You could save money by getting a different lock to the M18, and for that I'd recommend the OnGuard Brute X4 (LS). Its nearly as strong as the M18, but less than half the price.