The Lithium packs don't need nor want to be charged 24/7 like lead acid batteries do. Don't keep it on the charger. Just charge it and put it in a safe spot. I think it is a great idea to have. Especially in the colder months when batteries are less likely to have enough CCA to start the vehicle. You can also be a hero for anyone stranded on the side of the road. These lithium batteries aren't fans of freezing temps. So if you can help it, try to keep them above freezing. Never charge them below 32 degrees. You can, but below freezing they don't like it. You will reduce their life span. In addition to a jumper pack, get a kit. This includes first aid, water, blankets, jacket, gloves, socks, snacks, lights, flares, tire patch kit, sun glasses, extra phone charger, etc... I went with Audew. Has been working great. I got it on sale for about $25 bucks a year ago directly from Audew.