According to NFPA 855 standard what kind of fire extinguisher should I recommend for the facililty where Li-ion batteries, modules and ESS are mounted and stored?
One that has Class C rating as well as Class A rating. See NFPA 10 for proper selection and distribution. Dry chemical fire extinguishes should be avoided. Clean agent fire extinguishers are the best option. Some AHJs might allow carbon dioxide fire extinguishers.
And how about water mist fire extinguishers? Would it be ok for this case as well?
They should be OK. See NFPA 10 for proper distribution of that type of extinguisher.
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