OptiMATE Lithium 4s 0.8A, TM-471, 8-step 12.8V 0.8A sealed battery saving charger & maintainer

Easy to operate strong charger for lithium batteries...no complaints...charger and maintainer

Saved a completely dead battery in a few hours. Been using this brand for a decade and never fails except my old version that was for acid battery adhd said to be compatible with others doesn't work for the lithium when totally dead. Battery sat on bike dead for 7 months, this totally did the job

I also have the larger 5A Optimate lithium charger, and this one does just as well, albeit a tad slower on larger batteries due to the lower current rating - less expensive but certainly no less capable! Like all the Tecmate-Optimates, you can connect and walk away without setting anything knowing that you'll get the absolute best charge safely. Not often considered compared to other chargers is all the pre and post charge testing that gets done on a continuous basis, specific to the lithium chemistry. Something that lead-acid based chargers don't do properly with lithium. Close, but no cigar. Note that "walk away" does NOT mean leave for work or go on vacation. NO battery of any chemistry under major charge should be left unattended. Having said that, while I own and have seen the similar looking, lead-acid based "Optimate 2" do an OK job on charging lithiums due to it's overall simplicity, the lithium specific TM471 is a far better charger than the Optimate 2 for this purpose. You get lithium-specific voltage tracking, testing, low-voltage recovery, AND cell-balancing pulses near the end of charge you don't get with the lead-acid based Optimate 2. All voltages tracked accurately with my Fluke 87V monitoring the charge process, just like all my other Optimates. That's why I own more than one. :) The extensive post-charge testing (if you ALLOW it to actually do a 12 hour long-term test) can give you an indication of problems long before bike issues leave you stranded. I'm a battery geek and can quickly see through hype. No hype here. It is so refreshing to actually see a product do exactly what they say it does, and openly discuss it in the manual.

It's a great lithium battery charger! Not just a battery tender! Complete with easy to read indicators, and sturdy clamps!

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!

Per the Shorai website, their #SHO-BMSO1 charger is only compatible with their batteries through 2021. 2022 onward, OptiMate became the designated charger. Its list of features & included attachments greatly simplify a mundane task. Highly recommended.

Well, I haven't used this new charger yet, but it looks and feels like a quality product! I would hope so, though, because for some reason, Shoraipower.com (well-known for their awesome, super lightweight lithium-ion batteries) lost their supplier for their chargers, and they recommended this one!!! Very strange, but ok...! Lol...

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

È riuscito a recuperare una batteria LiFePO4 che con il caricabatteria originale non veniva caricata affatto, i led spiegano bene in che stato è la carica. Ottimo prodotto, straconsigliato!

Loisirs, très beau produit conformae à la description, vendeur de confiance, à recommander

What a great deal on a product. Works just as anticipated. Used on a EarthX battery installed in a aircraft.

Seems smart, considering user input is 'on or off'. First round it detected and revived my battery, second round it charged it. Win! Expensive, but does the job and good for the environment keep a LiPo battery going where lead acid batteries would be trashed.

Works as described