Tesla’s Battery Day is closer than ever, set to kick off on Tuesday at 4:30 p.m. EDT, 1:30 p.m. PDT. While CEO Elon Musk previously promised the event would include “many exciting things” that “will blow your mind,” a recent tweet downplaying the scale of the announcement to come at the event has left many unsure what to expect.

“Important note about Tesla Battery Day unveil tomorrow. This affects long-term production, especially Semi, Cybertruck & Roadster, but what we announce will not reach serious high-volume production until 2022,” Musk tweeted Monday.

Tesla enthusiasts can catch the event's live stream on the official 2020 shareholder meeting website.

As for what might be revealed at the event, one persistent rumor from May suggests that Tesla might be working on a “million mile” battery, referring to how far a car could travel while utilizing it. Reports suggest that this new development will lower the cost per kilowatt-hour for Tesla’s batteries to under $100, leading many to speculate that it would allow the company to sell electric cars for prices comparable to traditional gas-powered ones.

Musk has also suggested that new advances in the company’s factories could be on the horizon, stating that Tesla’s future facilities would move from “Gigafactories” to “Terafactories.” The use of “giga” and “tera,” as highlighted by The Verge, indicates that Tesla’s factories could be moving from the production of gigawatt-hour batteries to terawatt-hour ones, which are equal to around 1,000 gigawatt-hours.

Tesla A Tesla is pictured. Photo: GETTY IMAGES NORTH AMERICA / SPENCER PLATT