We thought the recall announced this week for the Ferrari 488 was rare. And it was, and is still. But this one’s even more so.

The latest recall notice posted by the National Highway Traffic Safety administration is for the Pagani Huayra. Specifically the 2017 Huayra BC and Huayra Roadster – seven-figure hypercars, both.

Now if you’re thinking those are rare beasts, you’re right. In fact, while the recall encompasses all the examples of Pagani’s latest coupe and convertible in America, that amounts to just sixteen vehicles. (Combined, not each.)

The problem for which they’re being recalled comes down to the battery. According to the statement, the battery may not provide enough power to start the car or keep it running. The fix hasn’t been developed yet, and no timeline for its implementation has been announced.

Supercar fans will know that the hyper-exotic Italian automaker, founded and run by Horacio Pagani, first launched the Huayra in 2012 as the successor to the previous Zonda. Made almost entirely out of carbon fiber, the Huayra packs a 6.0-liter twin-turbo V12, based (like the Aston Martin DB11’s) on a Mercedes-AMG design, and mounted amidships.

The initial version produced 720 horsepower (730 ps/539 kW). After all 100 examples of those sold, Pagani produced another 20 of the Huayra BC coupe, starting in 2016. With a more hardcore approach, the BC uses a more potent version of the same engine, now producing 745 hp (755 ps/555 kW). The Roadster version not only lobbed off the roof, but upgraded the engine even further to 754 hp (764 ps/562 kW).