Renogy 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.

The battery looks very well made, perfect for my application of powering my greenhouse

Pour chalet et alimenté par panneau solaire et très bon prix 🥇

Couldn't pass up the sale but now will evaluate "longevity" and "value for money"

I did not know if the battery was charged or not when it arrived. The battery failed. I do not know if it was a problem from the battery or from the controller.