The renewed MF series maintenance-free batteries are ideal for modern start-stop vehicles, hybrid and plug-in hybrid vehicles, as well as non-fuel efficient vehicles (eg pre-2005 and commercial vehicles).¶The batteries have increased thermal stability due to the use of a durable high-temperature mesh, have improved fast battery recharge rates due to lithium added to the electrolyte, and are more resistant to sulfation due to a special additive to suppress lead crystallization.