Lyft's adventure in e-bike rentals appears to be off to a bad start after two of the company's bikes had batteries catch fire in the last several days.

Lyft's thousands of San Francisco e-bikes were "unavailable to renters" Wednesday after the Examiner reports on a Wednesday morning bike-on-fire at a bike station at Page and Scott in the Lower Haight. That follows a bike that caught fire for mysterious reasons on Saturday at Folsom and Second Streets, also operated by Lyft's Bay Wheels program.

Observe:

Said Bay Wheels in a tweet this afternoon, "Because the safety of our riders is our number one concern, we are temporarily making the ebike fleet unavailable to riders while we investigate and update our battery technology. Thanks to our riders for their patience and we look forward to making ebikes available again soon."

As the Examiner notes, this is the second time Lyft's e-bikes have been pulled from the streets following a reported breaking issue in April that was sending people flying off the bikes.

Sometimes these bike batteries catch fire, apparently, and New York's Citi Bike program had its own fire at a Brooklyn charging station in March, as the New York Daily News reported.