It arrived quickly, although I haven't used it yet, the voltage is fine, I was able to charge it. I don't know exactly what secondhand means, but it looks new from the outside. I have previously bought 2pcs 24v/100Ah batteries from them and have been using them with satisfaction for my solar system for about a year. That's why I dared to buy a battery for my small boat here.
I am satisfied with this battery and I was surprised that by discharging and charging it I obtained a capacity greater than that indicated on the label, 266 w/h. I do not recommend discharging it below 11.5 V, this is so that you can have it for a long time and it will function within normal parameters. I recommend this type of battery with confidence. And the order came quite quickly and I recommend the seller.