4 × بطاريات LiFePO4 3.2V AA

These fit perfectly into my iLaunch controller and the 600mAh capacity gave me a full afternoon of launching rockets without any drop-off. Much better than trying to use regular rechargeables that just don't deliver enough voltage.

Put four of these in my iLaunch controller and it fires off rockets all afternoon without any voltage drop. The 600mAh rating is just right for multiple launch sessions.

Swapped these into my iLaunch controller and the 3.2V output is spot on—no more weak ignitions. The 600mAh capacity has handled a full afternoon of launches without a hiccup. Ground shipping took a few days, but worth it for the reliability.