1.5 Ultimate Long Power Pack

I have a bubble maker for winter fishing, and unfortunately, in extreme cold the batteries lose power quickly, causing it to work less efficiently. My organizer increases their lifespan by about five times. All batteries are connected in parallel, so the output voltage remains 1.5V.In my design, I used contacts ordered from AliExpress( $4.48 | 50pcs/set Spring Steel 18650 Battery Clip 18650 Battery Holder Battery Contact Battery Insert Accessorieshttps://a.aliexpress.com/_mO6NQIH), but you can easily find similar ones on your local marketplaces. I also added a pin to help the lid stay in place, but after printing the case and the lid, I realized the pin isn’t necessary at all. The lid fits snugly on its own, which actually helps it stay attached more securely.To connect the batteries to the bubble maker, I used a 3.5 mm jack (simply because I had one on hand), but you can use any connector you prefer.I hope this model will be useful to you. Thank you for your likes and boosts —Boost Me