Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green

The manual has many modes of operation but it also functions perfect for a plug and play. I have a lithium ion battery on my motorcycle and it has kept the battery healthy in periods of no use.

Lithium charger brought back my dead Lithium battery. I had to jump it with another lithium battery to get my dead lithium battery over 12 volts but after that my dead battery took a charge and completely recharged.

10/10

It did NOT save 2 dead Lithium batteries, but that's not the chargers fault, I guess they were just to far gone. The thing has some weight to it. It doesn't feel like a cheap piece of plastic junk. I am using it to maintain a lithium battery, and for that it is overpriced imo.

Complicated instructions when it comes to all the features but works to keep my Shorai Lithium Battery LFX36L3-BS12, properly charged.

High quality charger for lithium motorcycle and car batteries.

I bought this to maintain my EarthX battery over the winter months. So far it is performing well.

I use to keep an EarthX battery charged. The unit works, but the instructions are confusing, and the on board display is VERY confusing. I've given up trying to understand it.. but just connect and wait for the LEDs do do their thing and get a blue light (fully charged). I can't recommend due to the difficulty in understanding the units use, but it does keep the battery charged. Buy it if you need to maintain an EarthX, but look around for an easier to use unit.