This battery pack brings Nerf guns into the modern era - CNET
Amazon.com: NERF Rival Rechargeable Battery Pack : Toys & Games
Nerf Rival Rechargeable Battery Pack, Includes Wall Charger - Walmart.com
Looks like Nerf made a change to their rechargeable battery pack to reduce/eradicate cross compatibility with other brands. Currently doesn't fit in my Quantum, I assume I can simply cut the nub
This battery pack brings Nerf guns into the modern era - CNET
NERF Rival Rechargeable Battery Pack - Newegg.com
Upgraded 500-Round Balls Refill Pack Compatible with Nerf Rival Apollo, Zeus, At | eBay