Boston

Two battery technology start-ups in Massachusetts have filed paperwork indicating that they have each raised more than US$20 million in new investment.

24M Technologies, a Cambridge-based firm that produces semi-solid lithium-ion cells, filed a Form D with the US Securities and Exchange Commission indicating that they raised more than $21.8m through an equity release.

Woburn-based SolidEnergy Systems similarly filed a Form D indicating that they raised more than $28.8m, also through an equity release.