Have battery costs dropped 50%, or have battery prices dropped 50%? If it's only the latter, I wouldn't expect it to continue at that pace. We might be in an oversupply situation where battery makers have been increasing production capacity expecting a certain market volume, and now pricing has dropped below cost. (I know these situations well; my industry just came out of a year+ episode of this and it was painful.)
That said, if this is the case it will help me. Battery costs dropping that quickly will savage the resale value of EVs, so in ~3 years or so when I'm potentially in the market, there should be a ton of gently used EVs on the market selling for rock bottom because new EVs have significantly fallen in price over the intervening 3 years...