Need advice on whether this is possible

I have an off the wall question regarding repurposing hybrid batteries.

I own a food truck that was custom built by my friends and I. We made it an all electric food truck so that we don't have to use propane. In our control closet we're housing marine batteries as our auxiliary power source when we're trying to go "off grid" without the use of a generator for short periods of time, albeit with limited power draw. We have the batteries wired to an inverter feeding several outlets throughout and a a battery recharger responsible for recharging the batteries before they deplete. A generator can be plugged into the 50A outlet outside which supplies close to 10k watts, which is not enough to run at full capacity.

What I'm wondering is whether or not it would be feasible to repurpose a hybrid battery for providing additional power to supplement the generator. I've read that Prius batteries have relatively low amp hours as they're designed for micro cycling and that they're designed to be maintained between 50%-75% charge. I'm not sure how much wattage these batteries can provide and if they can be used for prolonged periods of time.

I only ask all of this because I have access to a free hybrid battery, which I presume is in good condition, off a Prius that was donated to the fire station I volunteer at. The car was involved in a wreck and is destined to be set on fire for training purposes. I'd love to use the battery if I can before it's sent off to be donated or sold.