AGM battery maintainer.

[f355spider]

For that price, it really should perform well /

The Battery Minder 128CEC2 does perform exceptionally well...I own two of them. Along with a few other Battery Minders (2012AGM and 12117TC).
I bought mine from this place, as they have the best price for Battery Minder products, only $185 with free shipping and no sales tax.
https://www.batterystuff.com/batter...r-and-lithium-charger-maintainer-128cec2.html

I recently bought a third one and gave it to a buddy...I'm a believer in their technology, as they restored two batteries that were showing lower and lower CCAs on my tester, in spite of using two competitor battery tender brands for the past few years. Both batteries came back with regular use of the Battery Minders over several weeks of plugging in each evening. Now I just use them once or twice a week.

 

[50yr Street Mech]

Noco 2 Genius does AGM and flooded, automatically