It's great to have a spare Batter pack for the V-18 Jashen Cordless Vacuum. When I bought the vacuum several weeks to ago, every supplier was out of stock for the battery pack necessary to run the vacuum (when you order the vacuum, it comes with a battery, but I wanted an extra). So, I ordered a battery directly from Jashen (who was also out of battery stock at the time), I figured that the manufacturer would restock before any other retailer. And, I was correct; and they came through for me. Now, when my battery runs out of juice, I can simply plug in the spare and finish the job. If the spare runs out before I finish, I always have the previous battery freshly charged in my charger ready to go. (What can I say, I'm 68 and slow at vacuuming). The batteries really charge-up quickly compared to those I have for other brands' cordless appliances and makes every vacuum job for me go seamlessly with batteries instead of getting tangled-up with a corded vacuum. It really makes the chore of vacuuming go so much faster than your conventional heavy vacuum; it's so much lighter and great on stairs..