My wolfbox portable car charger (4000a)…
My wolfbox portable car charger (4000a) was purchased for insurance I wouldn’t get stranded, however I kept it charged regularly and never even got to use it once before it broke and I actually needed it. I never dropped it, never left it in extreme heat/cold, it just sat and was charged atleast once a month to keep the lithium ion batteries from failing. I would recommend a different product!