Inteli-Power 4500 Series models can recharge the battery to 90 Percent in 3 to 6 hours using our Charge Wizard technology. Progressive Dynamics, Inc. is a privately owned corporation, established in Marshall, Michigan, in 1964. Today, PDI produces a full line of products for the RV, marine and specialty industries. No matter the product, at PDI you receive superior quality. Our product’s are designed, assembled, tested, warranted and serviced in the U.S.A.