<-bsp-bb-link state="{"bbHref":"bbg://securities/9474377Z%20US%20Equity","_id":"0000018f-4edf-d4b6-a98f-ffff94660000","_type":"0000016b-944a-dc2b-ab6b-d57ba1cc0000"}">Ambri Inc.-bsp-bb-link>, which has been trying to build an industrial-scale battery for 14 years, filed for bankruptcy after it ran through all the cash it had received from investors, including firms tied to Microsoft Corp. co-founder <-bsp-person state="{"_id":"0000018f-4edf-d4b6-a98f-ffff94660001","_type":"00000160-6f41-dae1-adf0-6ff519590003"}">Bill Gates-bsp-person> and hedge fund billionaire John Paulson.