My Schwinn Tailwind is just pedal assist only and its Lithium Titanate battery has small capacity compared to other types but was reputed to be very safe compared to other lithium ion battery types. A bit of research verified this, but I still charge on the concrete floor of my basement workshop or garage floor. FYI, here is a bit of what I found on the type:

"Lithium titanate (Li4Ti5O12, referred to as LTO in the battery industry) is a promising anode material for certain niche applications that require high rate capability and long cycle life. LTO offers advantages in terms of power and chemical stability, but LTObased batteries have lowvoltage: 2.5V vs. LiCoO2 and 1.9V vs. LFP

Nevertheless, the lower operating voltage brings significant advantages in terms of safety. Further, these batteries can be charged fast. Data shows that these batteries can be safely charged at higher than 10C. This means the battery can be charged in less than 10minutes. The LTObased batteries also have a wider operating temperature range and a recharge efficiency exceeding 98%. Although the energy density of LTO batteries is low compared to other lithium ion batteries, it is still higher than lead acid and NiCad batteries" Don