Not sure why you wouldn't recharge at the first opportunity after using your jumper battery. I have both a wet cell older unit that I have replaced the battery a few times over the years and a new style lithium. I have started many cars with the old one over the years and a few with the new one. The new one has started everything from our Honda CRV to a small block Chevy with no problem. I recharge after use and usually top it off once a year. There was still charge left after starting the small block and would have probably started another one. I carry the lithium in my truck, the other one stays in my shop for when I needed it.