I considered this, but was concerned about the lack of a vent tube connection. The battery in the W210 is located in a closed compartment under the rear seat. There's also a huge fuse block right next to it. So hydrogen buildup is definitely a concern. Optima says their battery will not vent hydrogen under normal conditions, but they admit it is possible. Does anyone else worry about this?

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References