Nerf Rival Rechargeable Battery Pack, Includes Wall Charger - Walmart.com
After ignoring lots of advice and being told that I was "building a bomb", I'm happy to report that my 18650 powered Stryfe is fully functional! : r/ Nerf
This battery pack brings Nerf guns into the modern era - CNET
Amazon.com: Nerf Pro Gelfire X MrBeast Full Auto Blaster & 20,000 Gelfire Rounds, 300 Round Hopper, Rechargeable Battery, Eyewear, Ages 14 & Up : Toys & Games