Renogy 12 Volt 100Ah Deep Cycle AGM Battery, Lead Acid Solar Battery

The battery work good for about 2 weeks and then it wouldn't hold a charge I thought originally it was my charging controller I replaced it and it's still doing the same thing but the battery worked good for the first two weeks

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...

Battery is impressive seems like it should last long. Very heavy 123 lbs but has nisce strong handles to lift it.

Have only had about a week now but has performed flawlessly! Was a direct fit and dropped right into my jeep. Has powered my off road light and vehicle no problems!

Bought batteries on Black Friday a 3 months ago and they will not hold voltage above 11.6v. after stilling in at freezing temps. Is connected to a solar tender does not seem to help. Update, was able to recover the battery by leaving it plugged into a float charger over night. It has been good sense then.

These things look good on paper, but they are smoking hot garbage. I bought a bank of eight to run my well and greenhouse, and they don't stand up to even modest use ( run a well < 30 mins per day, a few lights and a camera at night, some irrigation pumps for brief periods, and a wireless access point 24x7). Warranty replacement is pro-rated and involves additional cost that make it not even worth pursuing. Disposing of these monsters is no picnic either. After replacing half of the battery bank before the 3 year mark, I'm cutting my losses and replacing the whole battery bank with something from another manufacturer. Pick something at random and you'll likely do better.

Nice Sale Nice Battery!

These batteries came well packaged and fully charged. These work well and I expect 8-10 years of service out of them. I’ve been using similar batteries on my off grid cabin 12v solar system with 200 watts of panels. I also have the system set up with an RV style generac 4000 G generator that I only fire up when I need to run a saw or the washing machine.

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.