Tesla Inc.'s stock was set for a fifth consecutive session of gains as anticipation heats up for its "Battery Day" event next week, recouping some of its recent valuation slump following a sell-off and surprise exclusion from the S&P.

The company's shares (TSLA) were at $446.29, up $26.67, or 6.36%, near midday Tuesday, still $57 per share shy from its early September highs. The all-time high Tesla stock closing price was $498.32 on August 31. The Tesla 52-week midday high stock price is $502.49.

Traders told Reuters the recent gains were in anticipation of the electric-car maker's "Battery Day" next week, where Chief Executive Officer Elon Musk is expected to tout the latest improvements in Tesla's battery technology.

"That's given ammunition for the bulls again," Keith Temperton, sales trader at Forte Securities said.

"The battery side is critical for what happens to Tesla. Otherwise it's literally just another carmaker. If that proves to be a game-changer, then the stock goes higher again," Temperton added.

Wall Street analysts are still not fully convinced about Tesla's long-term prospects. The average rating on the company's stock is "hold" and median PT is almost $140 short of current trading levels, according to Refinitiv Eikon data.

Shares of electric-vehicle maker Nikola Corp., which is in a public spat with a short-seller that has accused the company of "fraud," were down nearly 8%.