The electric-vehicle maker will pay $4.75 for each share of Maxwell stock – a 54.7% premium over Friday’s closing price of $3.07.
Maxwell is a maker of ultracapacitors, which help to reduce the size and cost of batteries used in electric vehicles.
The San Diego-based company's shares soared 49.7% to $4.60 in morning trading, while Tesla shares dipped slightly to $309.87.
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-- Updates share prices --