What are battery limits

The battery limits for FIRST Tech Challenge robots are as follows:
- The main robot battery must be a 12V, 3000mAh NiMH battery with a 20A fuse.
- The battery must have an in-line replaceable fuse on the positive cable.
- The fuse must be a 20A Automotive-Mini (ATM) blade-style fuse.
- Commercial Off The Shelf (COTS) USB battery packs are allowed as auxiliary power sources, but must be manufactured by a reputable brand, within allowed Watt-hour capacity limits (100Wh or less), and include standard safety features.
- COTS USB battery packs must be secured on the robot, have unused ports covered, and be charged properly.

Rule G202
Robot Battery Care, Charging, and Fuses
COTS USB Battery Pack

Sources
- Power Management Best Practices
- What Makes Battery Voltage Sag?
- Robot Battery Care, Charging, and Fuses
- FRC REBUILT: The 'Evergreen' Rule Changes for 2026 — 7:33 to 9:56 — Brogan M. Pratt
- Everything Thats Changing From DECODE to BIOBUZZ — 5:01 to 7:31 — Brogan M. Pratt