SK12V206PH | SOK Marine Grade 12V 206Ah LiFePO4 Battery | Sealed Plastic Box

Great service so far

The batteries arrived on time and in very good packaging. The initial impression of build quality is very good. We will install on the boat today, boat won’t have a good feel for how they are working until the system is complete and working in the spring

Purchased three marine 206ah batteries for the RV. More then enough power to run our mini split for heat at night and make dinner, morning coffee and tea all before the next days sun is available. The batteries using my charger system took just over 24 hours to settle in. I have two 80ah solar chargers, 600 watts of solar on one and 800watts on the other. Running a main 3000 watt inverter with a 2000 watt as a spare. Batteries are typically charged by noon from a night of running min-split as a heat pump. These batteries replaced six 100ah AGM batteries. The weight savings is incredible! I went with marine style only because I would rather have plastic instead of metal in my tight battery box. One thing with the marine style, that I did know in advance, but other May not, is they do not sit flush to each other. I staggered them. The bolts holding the top to the case extrude out the sides. No big deal if you are aware of it. I use small cargo style straps to hold them in place. I had incorporated the straps into my battery box design. The straps are more capable of dealing with these light weight batteries then they were with the heavy AGM’s. I had asked a question concerning a technical spec before purchase, I received an answer back promptly with a valid justification. Support is great! I will definitely purchase in the future.

I bought (2) of the 206aH batteries in the marine enclosure a few years ago. They live on my boat and get charged by both shore power and DC-DC charging...and are working well. Overcurrent protection shut-off works and they charge..BUT.....

The 'over-discharge' function does not. I have had the batteries go below the recommnended voltage and have to 'wake them up', as expected with many lithium batteries. But...these batteries, both of them, discharged below the level the BMS would allow current to resume. The BMS is the flaw. Now I have 2 batteries that I have to either 1. find a BMS for that actually works like advertised 2. get rid of these batteries (no matter how well built) or 3. have SOK send me a BMS for each that DOES WHAT IS SAYS. If, as a customer you are not familiar with these kinds of failures, this is what it means: if a BMS 'OVER CHARGES' they catch on fire and burn down your vehicle...if the 'UNDER CHARGE', there is nothing you can do to use your batteries again short of tearing them apart, bypassing the BMS, and rescuing them. If you are on the road or on a boat....yeah...not a great experience, especially if you don't have 412aH of other batteries laying around.

I continue to experience an imbalance with my battery cells. One cell continues to remain lower than all others by quite a bit (up to .3) while the other charge successfully.

I requested a return and support so far has been poor. No responses for return, they mention they do not believe anything is wrong with the cells, but I can guarantee Battleborn would not let something like this slide.