Replacement Charger for 2018 Quick-E+?

I'm looking for a second charger for my Quick-E to keep at work. I know that I can get one through my LBS ( ~$200, i think ) but I'm wondering if there are any other ones out there that might be worth looking into. I know there are a ton on amazon and other sites but I'm afraid that I will get what I pay for with some of those. Anyone have experience with any non OEM chargers? Thanks!
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following - interested as well -

other than the potentially suspect quality of dirt cheap chargers from Alibaba, etc. … the biggest issue might be the connector which is not the standard coaxial LV connector a lot of batteries use