How is this post at all helpful in this thread...when you don't even have data to back it up...after @GerryAZ gave such a thoughtful answer to the previous question??
I've been involved with electric bicycles and scooters since 2001. I've seen many reports of pack failures, and had packs fail myself. SLA batteries more often get killed by charger failures (runaway charging), lithium packs get killed by BMS failure, NiMH packs succumb to heat, usually from badly programmed BMS units. Try sites like VisForVoltage, EndlessSphere, etc, for confirmation.
Why do you have to comment on EVERY topic in EVERY thread!!
There are threads here in which I've never commented, and others in which I rarely comment. This topic is directly relevant to my own Leaf experience: I had a nearly dead 12 volt battery when my car was one year old (power locks didn't work, emergency start procedure worked), and have been using a maintainer ever since. I still have the same battery, after 4.5 years, that was nearly dead after one year. I'm guessing that it just seems to you that I comment on everything, so I suggest you filter me (select "add FOE" in the user controls) since you have no interest in what I have to say.