2009 Chev 1500 4x4 Hybrid. Jumps at starting from stop sign, bells & dingers too. Were told we needed a new battery system under back seat. $5000.00. 101,000 miles on the truck. Can we run the truck without replacing the unit under the seat? This is sporatic, not all the time.
Get a 2nd or 3rd estimate . . . that sounds awfully high
As far as I know, the battery back is fairly low voltage, around 42v . . . I believe it’s actually 3 12V batteries, but not the typical 12V batteries you can get at any auto parts store
$5,000 is a little high, you can get one reconditioned by a hybrid battery specialist for $2,500-$3,500 and depending on which state you’re in they may offer free installation.
So I was mistaken . . . 
That generation GM hybrid truck used a 300V system, unlike the earlier generation, which used 3 12V batteries under the seat. those batteries were also encased
anyways, seems like there’s several choices and price points for a reconditioning battery for this truck, including a Dorman part . . .
Who told you the battery needs to be replaced? Can you describe the problem with more detail?
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Have you asked this on a 1500 hybrid forum?