If you are worried about battery fires, that would only be an issue in the Rav4 PHEV (Prime). The traction battery in the Rav4 Hybrid is Nickel Metal Hydride (NIMH) = no fire risk. The Hybrid is only $2,000 more than the gas-only Rav4, and you will definitely recover that money in gas savings in about the first 80,000 miles. If you live in California, where gas is about 40% more expensive that in the rest of the US, you recover the price premium of a Rav4 Hybrid in 53,000 miles. The P-710 transaxle in the Hybrid is way less complicated than the 10 speed automatic in the gas-only Rav4. Toyota has been making these Hybrid transaxles since 1997 (the first Prius), and they know how to make them reliable. Millions of them worldwide have gone 250,000+ miles with no problems.
Just talk to any of the Rav4 Hybrid owners on this Forum and you will be hard-pressed to find someone who wishes they had bought something else.
The Hybrid's powertrain management system for starting the gas engine is a 30 hp electric motor, MG1, embedded in the transaxle, not a conventional starter motor. The way the Rav4 Hybrid drives, is that you pull away from a stop on the 120 hp MG2 electric motor plus some added torque from the MGR rear axle motor, until you get to about 14~18 mph, then MG1 spins the gas engine at about 1,100 rpm and it starts, nearly silently, and with no perceptable jerkiness.
My personal ride is a 2023 Rav4 Prime. The price premium on these is $12,000 because of the big Lithium battery. I went for it because we have cheap electricity in my city thanks to a not-for-profit Municipal electric service, and hideously expensive gas ($4.50/gallon), so I felt the $12K price premium was at least somewhat justified. Besides, the Prime is fun to drive, and I get 58 miles of EV range on a full charge. I am averaging about 6.5¢/mile total cost for gas and electricity, compared to about 12¢/mile that it would cost to drive a Rav4 Hybrid, so the mileage to recover the $12,000 price premium is about 225,000.
Get a Rav4 Hybrid, You won't regret it.