Deep Cycle AGM 12 Volt 100Ah Battery, 3% Self-Discharge Rate, 1100A Max Discharge Current, Safe Charge Appliances for RV, Camping, Cabin, Marine and Off-Grid System, Maintenance-Free

Got tired of adding water to both of my 5 year old deep discharge flooded lead acid house batteries for my RV. My battery compartment is just large enough for two Group 31 batteries and these are near in size to that so I bought two of them. It also helps that the price on Amazon is very good! They look good and were easy to install. Quality looks very good, though that's just a visual check at this point in time for me. Note that the terminals have M8 screws - if you get battery cables with M8 (5/16) lugs there will be more metal at the end vs the 3/8 holes on my previous cables which rotted away. Nice removable caps on the battery terminals which help when connecting multiple batteries in parallel. See my photo of the final installation. I bought a Victron SmartShunt IP65 along with the batteries so that I would have more confidence in the state of the batteries when boondocking without shore (120VAC) power. There is a good datasheet for this battery on the Renogy website but that does not include two parameters that can help accuracy with the Victron. So I asked Renogy customer service for the information which they quickly provided! Bravo to them for this! The two parameters and their value are : Peukert’s Constant: 1.1 and Charge Efficiency: 90% I felt that the old batteries didn't have sufficient remaining capacity - though they were originally 120Ah each. Whether that was true or not I really don't know. See below for the reasons for this and why I got the Victron monitor - which I really like. I have a Renogy Rover 30A solar charger which shows the battery voltage and some kind of state of charge (SOC) number. But the voltage on a lead acid battery is an accurate measure of SOC only if the battery has sat completely idle (i.e. disconnected) for at least 24 hours which is a non-starter when you are camping. The solar controller doesn't know how much current is being drawn from my battery pack (both the house load and solar are connected directly to the battery) so it can't calculate any kind of reasonable load drop. From what I read the loaded voltage could be 0.5 to 0.7v or more below the resting voltage as related to SOC. Hence the uncertainty with the old batteries. The shunt battery monitor is in series with the negative battery terminals so it knows all the current in/out of the battery, plus voltages and temperature. So it can calculate SOC more accurately. Note, however, that all it can calculate is the percentage of the battery capacity. If you enter 200Ah as the net capacity for the battery pack and you use 100Ah then it will show roughly 50%. But just exactly what the net remaining capacity is for a battery that is a couple of years old is a difficult question to answer. If the actual capacity has degraded to 150Ah, then that 100Ah discharge is bringing SOC down to 33% which is definitely not good. Apparently the correct way to test actual capacity is to discharge it at the spec rate (100Ah divided by 10 hours equals 10A) until the voltage drops to 10.5V. You want the current to be constant even though the voltage is varying and you definitely want to stop when you get to 10.5V and then immediately charge it up again. I don't see myself setting up such a test fixture nor do I know any place that can do this kind of test...

This battery is just what my camper needed It will run the furnace fan through the night. Holds a charge as advertised and responds to a solar panel charge to reach full capacity easily. It is reasonably heavy, but that's what I have gotten used to in rv batteries. The price is acceptable now.

I replaced the battery that came with my Jayco travel trailer with this one. A few things you probably will want to know. The battery dimensions are: 13.1 x 6.9 x 8.6 inch / 332 x 175 x 219 mm - no group size is printed on the battery, if you want this to fit your application, those measurements should help. Secondly, if you are used to seeing the standard pos and neg automotive type posts on the top of the battery and need them for your application - you will need to buy screw in posts separately. The battery only comes with minimal, terminal hardware. If you are using this in a camper like I am, you'll want to make sure you purchase the posts separately. Mine will be delivered tomorrow so I'm not going to advise which ones to buy (yet). Alternatively - you may find that it's far better to just replace the connectors on the camper side instead. Just keep in mind that if you are upgrading from a battery that looks like a typical automotive battery, you will definitely need to update your connectors for this one. The 'battery bolts' that come with the battery that you would typically connect your 'load' to are 8mm bolts. ( M8 x 1.25 x 20 mm ). This battery is a heavy beast and is almost too heavy for me to move myself. If you will be moving it around more than a couple times a year, definitely keep this in mind as it's feels much heavier than the battery that came with my camper... which was a more manageable typical automotive size. This battery has 30 amp hours more than the one it is replacing so that explains it, just be forewarned that it's *heavy*. My battery and battery box arrived undamaged which is a small miracle. The packaging was clearly up to the task, but just barely. The outside of the box showed a decent amount of damage. Battery is made in Vietnam, so to get to me here in Colorado, it passed many hands along the way. I have a small, 1 amp maintenance charger that I actually use for my Jet Ski, but I am currently charging the battery with that. It does not arrive fully charged, which I expected to be the case. This battery should pair nicely with my 300 watt solar panel setup on my camper. I will report back after I have some real world use. Shipping was fast.. as I've been tracking this product for a few weeks now, I've noticed that the shipping times (for Prime) vary from 2 days, to 6+ depending on the day I am looking. I guess it depends on which warehouse fulfills the order, but it only took 2 days for me to get mine. Despite living in a fairly large city, finding a battery like this locally is usually a pretty big pain. No core charge, included shipping. It's a great option. The big risk you are taking is if your battery shows up undamaged. Mine is perfect. You place your bets and you take your chances on that one.

These batteries are EMP proof and will outlast any lithium electrons BMS board when a lightning strikes near by. Or spontaneous start a fire, Been there done that. When we were at a campground and a RV a few camp sites down lost his RV because of a bad BMS didn't work right. Everybody packed the stuff and left while his million dollar motorhome went up in smoke. The likelihood of these batteries doing that are slim to none. We installed a Bluesea battery fuse on top of battery post on 200Ah. Also lithium batteries produced very toxic chemicals when they burn. I seen video's of van and RVers putting these time bombs inside there RV on even under there beds. WHY only to get a little more time on a charge. ALL batteries will go dead and need to be recharged sometime. So what's the point AMG can operate in colder and hotter temperatures with out worrying about a fire or having a BMS cut you off when its 28 degrees. Old tech is where I'll put my money. Just use one battery to keep weight down and use solar and a good Honda generator when and it will happen your battery dies. One other thing never let your batteries go pass 50% SOC. We have a solar system that uses LA batteries and we gotten over 7 years on them because we only go down to 50%. Lithium is like ever new toy on the block everyone has to have them unit they don't. What is new today will become old tomorrow when new tech sells you a new scam. Alway have a generator you can beat them for longevity and use. It's the Greeneys selling you these batteries save the world with lithium fires ya right. I watch Will P. On utube when he cuts into lithium batteries I see wires everywhere and see fires later with lithium. Watch StacheD training about Lithium fires. Amazing you never see that many video's on lead acid or AMG fires.

These are great batteries but the one thing I’m not happy with is that the terminals are 8mm (metric) and not the industry standard of 3/8”. This makes it a challenge to find a kill switch that can easily be added.

Bought 2 batteries as the reviews were so positive and I wanted at least 100ah for each. Price was right. Batteries arrived ahead of schedule and packaging was in perfect shape. Charged batteries to 100% as recommended before installation. Installed in our RV which has a battery disconnect. Tested the Jack and worked great with full power, turned off disconnect and came back a 6 days later to hook it up and batteries quickly died as I was lifting and then retracting the electric Jack. Battery is to last for up to 3 months when you start with a full charge at temps above 5 degrees. Temperature was above 20 for the 6 days and 45 degrees F when I tried to use tbem. Batteries were at 25% with one measuring 11.7 volts and other 12.1. Put them on a 2amp charger and one battery made it to 95% and the other made it to 35% and that battery started to give a bad battery reading on the digital display on my automatic charger. The battery that charged to 95% had already discharged to 75% the next morning. No wiring was connected to either battery. Although these batteries are non returnable, Amazon is sending me replacements within the next week. I would say do not wait to open and charge these batteries, make sure they test correctly and hold charge. My assumption is that these 2 batteries were stored in an area during transport or at the distribution and we’re allowed to freeze. The fact the both batteries failed would lead me to believe this was the issue. Annoying to install and then need to uninstall along with Amazon not able to physically take the batteries back, now I need to pay to dispose of them. Having said this, I have notoriously bad luck. I hope the next set holds a charge. Amazon customer support is top notch and they always try to make it right.

I have 4 of these batteries I use for a solar power system for my RV, they work good and, I would buy them again

Perfect fit, has our Goal Zero Yeti1250 back in action!