Can I use different kind of batteries mixed together? No, please never mix batteries from different types, brand or equipment. Using different types of batteries or batteries with a different age in an appliance may cause leakage or in the worst case explosion.
You have obviously not been told of the dangers of mixing drugs.
Wouldn't want to sue should you suffer - Astra would say it's not me and Moderna would say it's definitely not me and your lawyer would probably not even take on your case. Never know, the best case may just result in some leakage and the worst case may just result in an inner explosion.
