With hybrid, you are having like two type of engine inside car, thus twice number of parts with failure possibility

Well, how long your Lithium battery last? It is stated that the Lithium is designed to have 500 time recharge but well I can say it can last more recharge cycle, However, how long the battery last between recharge? I believe you know that the time for every recharge get shorter and shorter.

The real fact is that the hybrid cars nowadays are powered by either Li-Ion, NiMH or even lead acid. The Li-Ion is the latest trend with claims of even 15 years battery life. The NiMH battery is more common nowadays since it is cheaper because has been in market much longer, but unlike Li-Ion, it has memory effect and has lower capacity than Li-Ion plus it is losing charge faster than Li-Ion.

Yes, the Li-Ion is the best among the battery current until new technology coming up like Graphene or LFP ( Lithium Iron Phosphate) which has higher power density become more commercial.