Embattled electric bike maker Rad Power Bikes is facing another challenge as the U.S. Consumer Product Safety Commission (CPSC) issued a warning to consumers Monday to stop using some of the Seattle-based company’s bikes because of danger posed by their lithium-ion batteries.

The product safety warning urges consumers to immediately remove and dispose of hazardous batteries that “can unexpectedly ignite and explode, posing a fire hazard to consumers, especially when the battery or the harness has been exposed to water and debris.”

The CPSC said Rad “has refused to agree to an acceptable recall” for the batteries, which are manufactured in China.

The batteries were sold as replacements and with a variety of Rad bikes via Rad’s website, Best Buy stores and independent bike shops. The battery model number (HL-RP-S1304 or RP-1304) is printed on a label on the back or rear of the battery and bike models included: RadWagon 4, RadCity HS 4, RadRover High Step 5, RadCity Step Thru 3, RadRover Step Thru 1, RadRunner 2, RadRunner 1, RadRunner Plus, and RadExpand 5.