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Stefan,
Amps tells you what current it can deliver but not for how long it can deliver that amount.
Ampere hours lets you work out how long it can deliver a given current.
900 Amp, 12V, 17Ah means it can deliver an instantaneous 900A for 17/900=0.18 hours (which drain would probably damage the cells), a continuous 17/12=1.4 amps for 1 hour, and so on.
Lots of slewing is what really determines how long it will last. The manual says the optional power supply is 12 VDC-750 mA so the absolute minimum you could expect would be 17/0.75=22.6 hours, and probably several times that.
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