OptiMate TM-291 Lithium 4s 5A 10-step 12.8V 5A Sealed Battery Saving Charger & Maintainer

I have been into motorcycles for many years and that means I have been into motorcycle batteries a long time too! Lithium batteries are far superior for motorcycles. All aspects are enhanced-- less weight, no liquid acids, mount in any orientation, smaller yet more powerful, hold a charge and last much longer. Charging is different for Lithium and their are many motorcycle battery chargers out there for them. I have tried the upper tier of chargers and OptiMATE is a solid A+. The most sophisticated of the bunch and exceedingly easy to use. They have been in the business for a long time.

Even though the output is on the lower side it does the job and is compatible with all Lithium batteries.

This thing is extremely advanced. Many other lithium chargers are just maintainers, but this will actually charge and rebalance cells. I have 3 motorcycles with lithium batteries and this 4 bank is perfect. I have tried SEVERAL other chargers but this one is the BEST.

Charger saved the EarthX ETX680 on my Sportcruiser airplane. It was discharged to 4.1 volts and several attempts to recharge it using a couple of different EarthX approved trickle chargers failed. I tried the EarthX recommended approach of momentarily hooking a good 12 volt battery in parallel with the trickle chargers to no avail and had resigned myself to having to replace the battery.After reading the reviews, I ordered the Optimate 4s .8A charger, which was received the next morning. I love this charger. It's totally automatic. Just connect and it interfaces with the built in BMS protection circuitry on the battery and goes into Save mode if the battery is more than 50% discharged. A light tells you whether it is in Save mode, charging, or fully charged. Unfortunately, the lights are not labeled, so I used my label maker to mark them, which is no big deal.This charger just works!

My husband really liked it and recommended it to several friends.

Been one of the best chargers I used. Much better than battery tender

I have a Porsche Cayenne with a smaller Li battery for the electronics. If the car sits for days the battery has a switch that shuts it off so it doesn’t drain it. This charger claimed it turns the switch back on. It does.It also does a good job of showing the status of the battery and charging rate.

If it go in the the BMS mod just leave it plug into what you want to charge and unplug the optimate and plug it back in it will start charging again