I use a lot of Ni-MH batteries for my RC transmitters and receivers. The VX4 handles them perfectly – the 0.5A charge current for Ni-MH is gentle and extends battery life. I also appreciate that it can charge D-size Ni-MH cells, which my old charger couldn't do. The grading function helps me identify which of my older batteries need to be retired. The only downside is the 300mA discharge current for capacity testing – it's a bit slow. But for the price, I can't complain. Solid 4.5 stars.

Der XTAR VX4 ist der vielseitigste Ladegerät, den ich je besessen habe. Er lädt 3.6/3.7V Li-Ion, 3.2V LiFePO4, 1.5V Li-Ion und 1.2V Ni-MH – alles in einem Gerät. Die Kapazitätsprüfung ist bemerkenswert genau mit einer Abweichung von weniger als 3% gegenüber professionellen Maschinen. Das Display ist übersichtlich und zeigt alle wichtigen Informationen an. Der USB-C PD-Anschluss macht das Laden unterwegs sehr praktisch. Einziger kleiner Kritikpunkt: Die Entladestromstärke von 300mA für den Kapazitätstest ist etwas langsam. Trotzdem ein hervorragendes Produkt – klare Kaufempfehlung!

In a grid-down scenario, knowing the true capacity of your batteries is critical. The VX4 gives me that confidence. It handles every battery chemistry I throw at it – from LiFePO4 to Ni-MH D-cells. The fact that it runs on USB-C PD means I can power it from my solar setup or portable power station. The build is rugged and the included dust bag keeps it protected during storage. This is the only charger I'll ever need. Five stars without hesitation.

Le XTAR VX4 est un chargeur exceptionnel qui fait bien plus que simplement charger des batteries. La fonction de test de capacité est extrêmement précise – plus de 95% de précision par rapport aux machines professionnelles. Il supporte une gamme impressionnante de formats: du AAA au 32650. Le mode de récupération basse tension a sauvé plusieurs de mes batteries 18650. La ventilation fait un peu de bruit en charge rapide, mais c'est un détail mineur. Pour le prix, c'est un excellent investissement. Je recommande vivement!

El XTAR VX4 es el cargador más versátil que he probado. Soporta casi cualquier química de batería: Li-ion 3.6/3.7V, LiFePO4 3.2V, Li-ion 1.5V y Ni-MH 1.2V. La pantalla LCD es clara y muestra voltaje, corriente y capacidad en tiempo real. La función de graduación de capacidad tiene una precisión superior al 95%. El único inconveniente es que la prueba de capacidad para baterías grandes puede tomar casi un día completo, pero es un precio justo por la precisión que ofrece. Definitivamente lo recomiendo para cualquier entusiasta de las baterías.

I'm glad making the right choice buying VX4 V2 , this is an upgraded from 1st version. Tested charging with various battery types, works pretty good and above all products well made.

As an outdoor guide, reliable gear is non-negotiable. The VX4 has been with me on multiple camping trips and it's never let me down. The ability to test battery capacity means I know exactly which batteries to take on longer expeditions. The screen is bright enough to read in daylight, and the backlight can be turned off to save power. The wide compatibility with 32650 cells means I can even charge the big batteries used in some of my high-power lanterns. This charger is built to last – exactly what I need in the field.

Como fotógrafa, dependo de baterías confiables para mis sesiones. El VX4 me permite probar la capacidad real de mis baterías AA y AAA de 1.5V, algo que otros cargadores no ofrecen. La detección automática de química es increíblemente útil – solo pongo las baterías y el cargador hace el resto. Viene con un adaptador PD de 20W y una bolsa de transporte. La calidad de construcción es excelente. Si buscas un cargador que haga todo, esta es tu mejor opción. ¡Cinco estrellas!

The VX4's capacity test accuracy exceeds 95% compared to professional grading machines. I've verified this against my own lab equipment and the numbers are remarkably close. Being able to discharge down to 2.5V is a huge plus because that's what most datasheets use for capacity ratings. The automatic current selection based on power input and internal resistance is a smart feature. If you're into electronics tinkering, this charger is a must-have tool for your bench.

This charger is an absolute game-changer for anyone who deals with multiple battery types. I've been using it for two weeks now and it handles everything from my 18650s to AAA Ni-MHs without any issues. The capacity grading function is incredibly accurate – it tested my XTAR 1.5V AA 1200mWh battery at 1161mWh, which is within 3% of what my professional grading machine shows. The screen is bright and easy to read, and I love that it automatically detects the battery chemistry. Yes, it's a bit larger than I expected, but that's because it can accommodate up to 32650 cells. Definitely worth every penny of the $39.90 price tag.

I use the VX4 primarily for testing the 18650 cells I salvage from old laptop batteries. The grading function is perfect for this – it charges, discharges to 2.5V, and recharges while measuring capacity. The automatic chemistry detection means I don't have to worry about misidentifying battery types. The only thing I'd change is adding an internal resistance measurement feature – that would make this charger absolutely perfect for battery matching. Still, for $39.90, this is an incredible value. 4.5 stars.

As a photographer, I go through a lot of AA and AAA batteries for my flashes and remote triggers. The VX4 has been a lifesaver – I can finally test the real capacity of my 1.5V Li-ion batteries instead of guessing when they're dying. The USB-C PD charging is super convenient, and the included 20W adapter means I can use it anywhere. The display shows all the critical info at a glance. My only complaint is that capacity testing large cells takes almost a full day, but that's to be expected with any serious tester. Highly recommended!

A wonderful device that deals with any batteries i throw at it, very satisfied with the purchase.

I have over 50 flashlights and probably 100+ batteries in various sizes. The VX4 is the only charger I need on my bench. It handles protected 26650s and button-top 21700s without any fit issues. The springs have less tension than other chargers I've used, which makes inserting and removing batteries much easier. The grading function is a godsend – I can finally weed out the weak cells from my collection. The USB-C input means I can even charge batteries from my laptop in a pinch. This charger is the MVP of my flashlight hobby.

As someone who sells batteries online, I need a reliable way to spot-check product quality. The VX4 has become my go-to QC tool. Its 95%+ accuracy compared to professional grading machines gives me confidence in my inventory. The ability to test 1.5V Li-ion batteries is particularly valuable since that's a growing category. The package includes everything you need – charger, PD adapter, USB-C cable, and even a carrying pouch. For under $40, this is the best investment I've made for my business. XTAR knocked it out of the park with this one.

I've been vaping for over 8 years and have used many XTAR chargers – my MC4S is still going strong. The VX4 is a significant upgrade. It supports 21700 and even 32650 batteries, which most vape shop chargers can't handle. The 3A single-slot charging is fast when I need it, and the 0.25A option is perfect for gently charging smaller cells. The fan does make some noise during high-current charging, but that's a small price to pay for the peace of mind that comes with proper thermal management. One minor gripe: you can't set different charge currents per bay – it's universal across all slots.

Many of the portable medical devices I work with use specialized batteries. The VX4 has become my go-to for testing and maintaining these cells. The LiFePO4 mode (activated by long-pressing the C/V button) is a feature I use daily. The accuracy is impressive – less than 3% error compared to our $5000 lab-grade equipment. The low-voltage recovery has brought several 'dead' device batteries back to life. If you work with batteries professionally, this charger will save you time and money. Period.

I bought this primarily to test the batteries in my kids' toys – you wouldn't believe how many 'dead' batteries are actually still good! The VX4's grading function is so easy to use – just press and hold the MODE button and it does the rest. The automatic chemistry detection means I don't have to think about which battery goes where. The display is clear enough that even I (not a tech person) can understand what's going on. It's become an essential tool in our household. Absolutely love it!

I'm trying to reduce my battery waste, and the VX4 helps me do exactly that. Instead of throwing away rechargeable batteries that I think are dead, I can now test their actual capacity and make informed decisions. The charger works with all my Eneloop AA and AAA batteries, and the grading mode tells me which ones are still performing well. The build quality is excellent – this thing will last for years. It's a small investment that pays off in reduced battery waste and smarter purchasing decisions. Highly recommend to anyone trying to live more sustainably.

Living on the road means I need gear that's versatile and reliable. The VX4 checks both boxes. It charges everything from my AA Eneloops to the 21700s I use in my flashlights. The included PD adapter works perfectly with my RV's USB outlets. I love that it can recover seemingly dead batteries – that's saved me from buying replacements more than once. The only thing to note is that it's not the smallest charger out there, but the functionality more than makes up for the size. A fantastic investment for any full-time traveler.

I've owned at least six different battery chargers over the years, and the VX4 is by far the best. The versatility is unmatched – it charges 3.6V/3.7V Li-ion, 3.2V LiFePO4, 1.5V Li-ion, and 1.2V Ni-MH all in one device. The low-voltage recovery mode saved a couple of my over-discharged 18650s that other chargers refused to touch. The build quality is solid, and the carrying pouch is a nice touch for travel. If you're serious about batteries, just buy this and stop wasting money on inferior chargers.

I've reviewed dozens of chargers over the years, and the VX4 stands out for one simple reason: it's the first charger that can truly handle 1.5V Li-ion batteries alongside all the traditional chemistries. The 'Visible Mixer' name is fitting – you can see everything that's happening on that crisp LCD. The V2 version fixes the compatibility issue with XTAR's CLR and LR series 1.5V batteries. My only suggestion for improvement would be faster Ni-MH charging – 0.5A is a bit conservative. But overall, this is the most versatile charger I've ever used.

Ok

My new default capacity tester & charger for all my 1.5V li-ion & 1.2V ni-mh battery cells.