Experienced before Yi dashcam can last about 1.5 years until it cannot hold a charge anymore. Everyday park outside in the sun and rain. But this mostly depends on the brand and quality of the dashcams.

Issues with lithium-ion batteries will differ. 1) Some cannot charge any more 2) gets bloated 3) starts leaking 4) worst case explodes.

Best to go for dashcams using supercapacitor as they'll last longer than those dashcams using lithium-ion batteries.