Mighty Max Battery ML9-12 12 V 9 Ah Rechargeable SLA Battery

August 18, 2026 Bought these for my Eaton 5S (SS) 1000 and they fit like a charm. 4 more amp hours compared to stock and they were infinitely cheaper!

Funcionó, igual se me estuvo apagando unos días el no break solo, pero ya esto debe ser otro problema

I am using 24 of these batteries at this point and about to invest in 48 more so. I have tons of equipment, and anything worth a darn is behind a UPS for clean power and to survive the occasional blip in power. In the last decade, I literally haven't replaced a power supply in anything at all except a TV once because I took a surge through the cable line I forgot to protect. The clean sinewave coming off of a good UPS ensures me maximum life from power supplies and other delicate components, protects my equipment from surges, and at the heart of it all is the MightyMax battery. I've been using the ML9-12 for all my UPS 650, 600, Network 40, and similar gear. I even build my own packs for larger installs like my 2200s and 1500s. MightyMax is the best battery money can buy, performing well over it's cost point. Don't buy expensive batteries from the UPS manufacturers. Yes, those batteries are great, but you can save money and not skimp on performance using MightyMax batteries. I have done extensive testing, being I'm a geek like that, and here is what I have found: 1. They really are 9AH, just a tad over. With a lot of testing, I am getting on average 9.6AH out of these batteries. I have never gotten under 9.2 and never more than 9.9. I have had other batteries claim to by 9AH and I get mid-8s which is horrible and deceptive. Not with MightyMax, whatever it says they are, they are. 2. They age really well. These batteries age well for their price. Realistically most cheap UPS replacement batteries last a year to 18 months or so and you replace them. The originals usually last around 4 years "on the shelf" meaning they rarely if ever actually get used. With no more than 1 deep discharge per year, you'll get right near that 4 years. The MightyMax batteries last around 3 years with the same "on the shelf" type usage but they are 1/3rd the price so I'm making money with "on the shelf" usage. 3. In areas more prone to outages that may cause deep discharges (like where I live), the OEM batteries last no more than 2 years when deeply discharged 6+ times per year. Sometimes the OEMs only last 18 months. The MightyMax batteries last 18 months or a bit more like this so they aren't quite as strong as the OEM batteries but they are close enough that at 1/3rd the price it is totally worth it. 4. These batteries can dump serious power. They handle a great discharge rate (C Rate) right on par with OEM batteries, in fact, the MightyMax actually fair a LITTLE better in this aspect, however not enough to write home about, but again, 1/3rd the price.... you seeing the pattern? Tips and Tricks: 1. The internals of the older APC UPS 600 are actually better than the internals of the new 650s IMHO. The difference from being a 650 or a 600? The battery realistically. Use this 9AH battery in an APC UPS 600 and magically you've got a 650. This battery fits perfectly in the 600 which usually uses a 7AH battery. I haven't seen any issue with Power Chute or anything reporting incorrectly and the charge rates seem to be relatively consistent. 2. The Network 40 ACP UPS has a little riser in the bottom (it's part of the molded plastic). If you cut that riser out you can fit one of these ML9-12 batteries and bingo, you have a APC 650! The battery charge rate is SLIGHTLY slower than the 650 from the 4 I measured but the parts look identical and I have seen no adverse effects during a power outage and run time is consistent. 3. If you have a battery that got a few deep discharges and seems to be shot, you can try using a desulfate mode on a small charger to revive the battery. I've done this with a few batteries that seem to have prematurely died before their time and it works in about a quarter of the cases. Since these batteries charge low and slow inside a UPS, sit topped off all the time, and always have a charge, they don't sulfate much, so this doesn't work all the time, but every once in a while you can revive one the ups is complaining about. These revived batteries seem to last another 6 months or so in my testing. OVERALL: Absolutely worth it. Go with MightyMax batteries every time.

I purchased 2 of these 2 packs of Mighty Max 12 volt 9Ah SLA batteries as replacement batteries for my UPSs, and they've been working exactly as expected. They arrived fully sealed, fit perfectly, and were ready to install with no issues. Since replacing the old batteries, everything has been running reliably with strong, consistent power. The build quality feels solid, and it's nice having a matching pair that performs evenly. They hold their charge well and have given me confidence that I won't have to worry about unexpected power loss. If you're looking for dependable replacement sealed lead acid batteries at a reasonable price, this two pack is an excellent value. I wouldn't hesitate to purchase them again when it's time for future replacements.

The ML9-12 SLA 12V 9AH battery is a solid choice for anyone looking for a reliable, maintenance-free power source for various applications. Here’s a breakdown of my experience with it: Pros: Compatibility: This battery is incredibly versatile, working seamlessly with a wide range of devices, including Aqua Vu, Marcum, Vexilar fishing electronics, Razor electric scooters, UPS systems, and even electric dirt bikes like the Razor MX350 and MX400. This compatibility makes it a go-to option for users with diverse needs. Reliable Performance: Whether used in high or low temperatures, this battery holds up well. I’ve used it in both warm and cold environments, and the performance remains consistent. Its ability to handle high discharge rates and recover from deep discharges is impressive, which speaks to its durability. Maintenance-Free: As a sealed lead acid (SLA) and AGM (Absorbent Glass Mat) battery, there’s no need to worry about spills or leaks. This feature also makes it easy to mount in any position, which is convenient for tight spaces or mobile setups. Shock and Vibration Resistance: The battery’s design allows it to withstand shocks and vibrations, which is a major plus if you’re using it in outdoor or off-road applications, such as electric scooters or fishing sonar units. Cons: No Accessories Included: The listing is clear that it includes just the battery. There are no wire harnesses or mounting accessories, which could be a downside if you’re looking for a complete kit. Make sure you have the necessary cables or mounts before purchasing. Size Consideration: While its dimensions (5.94 inches x 2.56 inches x 3.94 inches) are compact, it’s important to double-check the space available in your device to ensure compatibility. Overall Impression: The ML9-12 SLA 12V 9AH battery is a strong performer with great versatility. It’s a durable, maintenance-free option that works across many different devices and in various conditions. If you’re comfortable with the need to provide your own accessories and installation tools, this battery is a fantastic investment for reliable power on the go.