12V 330AH Lifepo4 Battery, Extra-Large Capacity Lithium RV Battery Built-in 200A BMS & Bluetooth,Support in Series/Parallel,Up to 8000 Deep Cycle.Perfect for RV,Solar Energy,Off-Grid System

If you have lead acid batteries, you should get this ASAP. Unbelievable difference.
Wow. Seriously. Unbelievable difference in both performance and speed. Simple installation (the only thing not discussed is the reed safety on the old charger plug. You need to cut it before the fuse, put a ring connector on it and connect it to the positive terminal). The display works, but is wonky to turn off. If you download the Bluetooth app for your phone, you don’t need it anyway.After installation, I thought about registering the cart with NASCAR. Huge boost in speed, but more importantly power. Absolutely no lag or drag…. I think it would kill Pike’s Peak. Seriously will never go back to lead acid batteries. This was cheaper than replacing all 6 old batteries, and the difference is night and day. Highly, highly recommend.

Ideal as home battery backup
TLDR: I bought this to use as a backup house battery for power outages. Although not intended for this, I have tested it in my backup system and it works great. It is has more capacity at a MUCH lower cost than the battery intended for my system. On top of that, it can be used more flexibility. You can read on for details if you want, but I highly recommend this battery in a home backup system.BACKGROUND (WHY): I had an extended power outage in 2023–almost two days straight–that brought my whole family to the urge of meltdown. I decided I never wanted that to happen again and started researching home battery backup systems in January 2025. There is a thriving community of DIY solar/battery backup enthusiasts online that recommend putting together a system with an all-in-one inverter, a server-rack battery, and a hand truck. I really liked the idea of building one and was about to do that when I realized that such a system has significant limitations for whole-house backup. First, the inverters are typically 120V, but you really need a 240V system for house backup (each leg of your home panel is 120V, and large appliances like central AC or an electric dryer use 240 all on their own). Second, server-rack batteries are very expensive, and free shipping is not a thing with them. By the time you build this system, you’re out over $2000, and for that you get a 120V 3kW inverter and 5 kWh of storage. Not bad, but entirely insufficient to back up your home in an outage. After further research, I learned that I could do what I wanted by buying a prefab home backup unit. I went with the Anker Solix F3800 for about $2400. Although also quite expensive, it comes with a 240V 6kW inverter and a 3840 kWh battery. Not as much as a standard server rack battery, but I was able to get an electrician to install a 50-amp generator inlet next to my home panel that the Anker could connect to through its 50-amp port. I tested it and learned that I can indeed power my entire house from this battery, but only for 2 or 3 hours at standard or even light usage. I started looking for ways to add capacity. Anker sells an “expansion battery” for this system, which is basically an extra 3840 kWh battery. It conveniently sits on top of the F3800 and plugs directly into it, and you can charge the internal battery and the expansion battery simultaneously from a wall outlet. But, it costs almost $2000…no thanks! Some more research led me to Jasonoid’s YouTube channel. He shows that you can use many different type batteries to charge the F3800 using an Anderson connector and an XT60 connector, intended for solar. He uses a golf cart battery as an example, and that led me to research them. I noticed immediately that a 48V 100Ah golf cart battery was the way to go. I found many that were under $1000, included a charger, meter, and all required cables, and that had excellent reviews on Amazon.THE ELEFAST BATTERY REVIEW: I deliberated a long time and eventually chose the Elefast because I had an excellent pre-customer service interaction with HK Megami through Amazon’s messaging system. The price had gone up to over $800 because of tariffs, but he agreed to give me the pre-tariff price after purchase (that arrangement was later honored by the seller). I also liked the look of the meter and appreciated that it plugged into a dedicated port on the side of the battery, rather than requiring multiple ring terminals under the M8 bolts. This is much cleaner and easier, and the meter is also much better than the black and white LCD ones that come with other batteries (see pics). So my first impression was good.The battery was shipped to me in under a week, which was impressive. I received the battery, charger, and meter in one shipment. The first thing I noticed when I took the battery out of the box was that it is HEAVY! I was expecting this, as the product page says it is 92 lbs. I am a pretty fit adult, but as a runner and not a bodybuilder, I am not muscular. I can barely deadlift this thing, but the handles and the form factor make it manageable to transport from my garage and up a few steps into my house to plug into the F3800. (More on that in a bit.) I actually consider this a plus, because it means there are beefy LiFePo4 cells inside this thing. The battery was at about 50% charge, which is ideal for shipping. I immediately started charging it with the included charger, which is also much beefier than it looks in the pictures. It is an impressive piece of kit, weighing probably about 5 lbs on its own. The power cable and power connectors are quite robust. The fan is noticeable while charging, but not unduly so. It immediately went up to nearly 18 amps (see pic) and stayed at that current until it reached 100% about 2 or so hours later. All good so far.To test the battery, I connected a set of Anderson connectors with ring terminals under the M8 bolts on the battery, and then an Anderson to XT60 connector to that. (I purchased both of those separately on Amazon, based on Jasonoid’s suggestions.) I then plugged it into another power station I have, an Anker C1000. This has a capacity of 1056 Wh. It immediately started charging the power station at 600W, which is the max it can accept through its XT60 (solar) connectors. It went from 0 to 99% in less than 2 hours, and the Elefast still had 78% charge. Very impressive. A day or so later, I drained my Anker Solix F3800 to zero by powering my house with it for a few hours. When it shut off at 0%, I plugged the Elefast into its XT60 port to charge it back up. I had not charged the Elefast in the meantime, so it was still at 78%. The F3800 immediately started charging back up at 1150 W, near the maximum of what it can accept (close to 25A at 48V). Accounting for some heat and conversion loss, this is also very impressive. I let the Elefast continue to charge until it got to 0% and shut down. At that point, the Anker F3800 was at 95%. This means that with a single charge to 100%–its first charge, so it’s not even been cycled properly yet–I was able to charge up 1056+3840*.95=4704 Wh. This is an efficiency of nearly 92%. This is incredibly efficient DC-to-DC charging, and I only expect that to improve as the battery cycles more. And since its chemistry is LiFePo4, I could do this daily for 10 years and still have 80% capacity left in a decade. That is extreme peace of mind for me and my family.CONCLUSION: If you want a home backup solution that can provide serious power to your home in an outage but don’t want to have to take out a home equity loan, you should seriously consider using a golf-cart battery like this. I like the Elefast because the price is competitive, the build quality of the battery and accessories is solid, and the customer service is excellent. I didn’t mention it, but it also has a Bluetooth app that works pretty well to monitor charge, voltage, and other data if you don’t want to or can’t use the meter. I feel like I built something akin to a Tesla Powerwall for about a fifth of the price. And at least through the end of 2025, there is a 30% federal tax credit you can claim for batteries over 3 kWh that are installed in connection with home backup systems.

Very Easy installation – Yamaha Drive 2
Replaced a set of Trojan batteries in a Yamaha Drive 2. We could get one drive around the neighborhood and they would die.Packaging was perfect. All parts needed were included in the kit except for some wood screws for this specific installation method, see below.There was a noticeable increase in acceleration but not any increase in speed. After spending twice as much time as we could get out of driving with the old batteries, there was still 83% left on this beast.I like the fact that this battery has an on off switch to keep any drain on the battery from happening when not in use.The gauge works well. One thing I noticed is that if you keep the battery switch on you can switch the battery off from the gauge on screen 2. I heard the relay that controls the power switch kick on and off when the screen button was pressed. Lots of good information on the gauge. It reminds me of the gas mileage calculator in my vehicle. It shows you how much time you have left on the battery based on the current consumption. For instance it shows a massive drain when you are accelerating but drops back significantly when you are up to speed. The only thing that I found that could have been better is the hole that the screen mounts to could have been slightly smaller to hold the screen tighter but after mounting the bracket to the cart it seemed to hold ok. BTW the cord that comes with the monitor screen is super long. See how much is rolled up in the pics.I chose to install the charger in the cart just make the indicator that it is charging viewable. I think you need to turn the battery on the first time you charge it.Overall I am very pleased with this installation. I liked that this battery case has the flange on the bottom to mount the battery in the cart instead of a strap.As far as how long it lasts, we will see. Yes there are cheaper batteries out there, I chose this one based on the other reviews and the way the case was made.A tip on the Yamaha Drive 2 installation. Get a Multitool with any flat blade and a small piece of 1×4, lay the piece of wood down next to the plastic ribs at the bottom of the battery tray and cut the rib down to 3/4 inch. This allows you to use a piece of 3/4 plywood as the base and have a nice even surface to set the battery and charger on to while maintaining some strength in the battery tray.