Bought 2 units of Samurai Dry Box f580 Pro recently. Bought it online! Everything was great, delivery timing, delivery packaging, delivery, condition of the products,... except for 1 thing. In one of the Samurai Dry Box f580 Pro, one of the button batteries was dead. I did a swap just to test if It was the battery or the digital meter. Digital meter was working fine after the swap, So I'm assuming the batteries given aren't new and neither one of it was checked before shipping it out.