Actually no, I don't think any automotive battery has a catalyst.  The
reason is that the catalyst
- is not cheap (auto mfg's are known for their cheapness)
- is easily fouled
- doesn't work when wet (cars will slosh the fluid around)
- will overheat if the battery is severely overcharged

I've seen them sold as an aftermarket add on for wet cells used in solar
storage applications however (catalyst replacement caps).

Dave
(also a chemist by degree, though not employed as one)



----- Original Message -----
> A few minutes ago, I spoke to my friend, who happens to be a chemist
turned

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