Start problem Sierra 1500 hybrid after engine revision

HL10

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I have a GMC Sierra 1500 Hybrid. Last months we did a complete engine revision, so they took out the engine. Last week they installed the engine (after 5 months) again but the car doesn't start anymore. According to my garage the car doesn't start because the big battery (300 V) under the back passengers seat should be empty. Does that make sense? And if so, how is it possible to charge the big battery?
 
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