I received all 8 of these Renogy Deep Cycle AGM 12 Volt 100Ah Batteries in good condition because they were packed with double box and double foam packing pads. They are very heavy and that care of packing was essential. They are wired in parallel for an 800 Ah 12 Volt battery bank. My 36-year experience with solar power taught me that connecting batteries and solar panels in parallel will provide much longer life than connecting them in series. Yes, you need much larger cables. I carefully charged the battery bank and recorded the discharge capacity over a 5-day period without any additional charging input. The discharge rate was a continuous 4 Amps. The capacity started at 800 Ah, 100% At 13.3 Volts. It took 120 hours to discharge down to 41%, 327 Ah remaining, at 12.1 Volts. That is a consumption of 473 Ah capacity. 4 Amps for 120 hours = 480 Ah. These batteries meet their specifications. I will only use them to 60% DOD (Depth of Discharge) max but mostly less than that. They have less points of failure compared to LiFePo4 batteries with their (complicated internal circuitry) and temperature requirements. They are good value, and good performance for stationary operation where weight is not a consideration. My application is the off-grid power source for my well. The input is 860-Watt peak solar array, output through the batteries to a 3000-Watt, 230 Volt AC inverter to power my well pump. The on-time duty cycle of the pump is low.

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...

Update: I just completed a14 day dry camping trip (no utilities) where I had to rely on battery power exclusively. I have been doing this for 14 years & use a small Honda generator to charge batteries 3x a day. These batteries outperformed the more expensive batteries I used before. However it is obvious they are meant to be solar backup. They adsorb a charge better, run TV and appliances well but sometimes struggle to start the built-in Onan generator. I also noticed that after sitting in storage for 3 weeks the terminal voltage is 12.8, not the 12.55 - 12.6 of Deep Discharge RV / starting batteries. All-in-all I'm exceptionally pleased.

I replaced my 6 yo Duracell AGM's with a pair of these. They claim to deliver 1100 Amps - unrealistically high except for a dead short. After 3 weeks of sitting idle I was pleased that the terminal voltage still was 12.74, a sign of great batteries. Then I started the generator, this pair of batteries barely turned it over, but it started. By the specs, two in parallel should deliver 2200 Amps but barely delivered 110...the max rated starting current for the Onan gen. After the gen started the terminal voltage was only 12.4.

I requested a copy of the voltage level and percent charge chart that most AGM battery providers have on hand for products. Being my purchase is going to end up on mountain radio site and existing equipment reports battery voltage and battery temperature. After explaining all of this in my service ticket, the responce I got was that they sell some sort of battery meter to measure capacity. Duh, I can see me driving120-miles every day (if physically accessible) to see what their battery meter shows. Sad, I used to know when Renology had a good service department with knowledgeable people that you could pickup the phone and just ask, rather than spending a whole bunch of time going through ticket process to end up with nothing. Subsequently, I received an email from them that nicely said you have received all of the information. Hmmm? Anyways, just going a little further below the screen I noted that they did reply with the information. I thought I recognized from web, appears to be from Alpine Power Systems. All good!

This battery does fit the Ryobi 38" riding mower after making some adjustments to the battery tray. Remove the front adjustable retainer in its entirely, remove the dividers (easily removed as they placed with double stick tape), remove the studs from the rear adjustable retainer and purchase 2 - M8 x 1.25 x 20mm stainless steel hex head bolts and attach the rear retainer directly to the battery tray using the purchased bolts. All 4 batteries now fit in the tray with about 1/8" to spare

Great price on an AGM. I believe this will be an upgrade from my Flooded batteries and do not expect themn to equal Lithiums. My Converter on my 2017 traler does not charge Litjiums correctly, so I went these.

I will update after we get them out and use them camping a few times IF they aren't what I expect them to be.

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.

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.

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

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

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.