Optima Batteries Digital 400+ 12 Volt Battery Maintainer and Charger for AGM, Lithium, Automotive, Marine and Powersport Batteries

The media could not be loaded. NOCO GB40 Boost Plus & Optima ChargerInitial Setup & Battery Issues- Upon arrival (04.27.25), connected the Optima Charger directly to my AGM battery.- Battery showed 1.5V—manual states device requires <2.5V to connect, and indeed, it wouldn't connect.NOCO GB40 Boost Plus - Emergency Jump Start- Borrowed a NOCO GB40 Boost Plus to attempt increasing battery voltage.- Turned the key in the car—no lights, no reaction.- Used the "!" button (hold for 3 seconds) on NOCO to deliver extra voltage.- Bam! Car lights switched on, and I was able to start it—pretty amazing.Charging with Optima Charger- Let the car run briefly to charge the battery, but it shut off after a few minutes (Toyota Prius Hybrid).- Disconnected NOCO, then immediately plugged in Optima Charger (already connected to battery).- Charger powered on, connected instantly, and displayed 13.2V—AGM battery appeared nearly fully charged (unexpected).- Within 5 minutes, voltage increased to 13.3V.Optima Charger Features & Observations- Easy operation—simply plug in, and it turns on automatically.- No power switch—just a power indicator light (not a button).- Requires selection of battery type using one of four buttons:- Confusion between two AGM options:- Optima AGM Common- Auto/Marine (Flooded & AGM)- Since I don’t have an Optima AGM battery, I selected Auto/Marine option.Overall Verdict- NOCO GB40 Boost Plus – Exceptional performance, saved my car, 5-star device.- Optima Charger – Reliable, straightforward, and well-built:- Reads voltage & amps, providing real-time battery status.- Bulky but durable—manual advises not to drop it.- LED screen looks outdated, but functionality matters more than aesthetics.- Comes with a 3-year warranty.- Worth keeping—serves as a trickle charger for long absences.- Cost comparison:- New battery (Toyota AGM): $250- Optima Charger: Approx. $139 with tax- Savings: $111Final ThoughtsFor anyone dealing with AGM battery maintenance, the Optima Charger is a no-brainer. It works as expected and delivers crucial real-time data. Highly recommended.

I bought this model to keep a charge on my truck. I have a new yellow top battery and wanted to see if keeping my battery plugged in would make the battery last longer so I plugged in my truck every day after I park in the garage. I have to wire hooked to my battery and coming out above my bumper so it’s easy to plug in every time.

Nice kinda expensive.

Fast shipping

Thanks A+++

I really like the multi-colored status bar at the top so you can see the status from the other side of the garage. I like the wall mount bracket and the hook.Biggest disadvantage seems that when first turned on you have to select one of 4 kinds of batteries. If you leave it hooked up and go away for months and there is a brief power failure, the unit will not restart until someone presses the correct button. Since me (and probably most people) use only 1 kind of battery, a 4 position physical switch would be a big improvement, automatically going into that mode when power is restored.I would have given 4 stars but I wrote to tech support to ask about this and got no response, so then I lowered my rating to 3.Update - I eventually received a response to my inquiry from the vendor"If there is a power interruption the charger will give the user 10 minutes to make a selection. If no selection is made, the charger will automatically choose a conservative charge profile that is “good” for all 12v battery types and indicate “all types batt’ on the LCD screen."I don't think this is as good as a mechanical 4-position switch, but will update my rating to 4 stars.

very reliableCompact sizeThe display is clear and the informative

Amazing item and well with the price.