New battery chemistry lasts 4,000 cycles in a lab prototype

A sodium-based cell kept 82 percent of its capacity after 4,000 charge cycles, researchers say.

Published 25 October 2026 at 8:30 am IST · 1 min read

The prototype cell was cycled twice a day for 5.5 years in an accelerated test. Sodium is far cheaper than lithium, but cells are heavier.

Scale-up and safety testing are next.

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