Replacement battery guide for the Unitree G1 — specifications, buying advice, and safe replacement.
| Capacity | 9,000 mAh (rated)verified |
|---|---|
| Energy | 421.2 Whverified |
| Rated voltage | 46.8 V DC (13S Li-ion)verified |
| Charge voltage limit | 54.6 V DCverified |
| Runtime | ≈ 2 hoursverified |
| Charger | 54 V / 5 A DC fastverified |
| Dimensions | 120 × 80 × 182 mmverified |
| Form factor | Quick-release moduleverified |
| BMS protection | Overcharge, over-discharge, balance, current, short-circuit + storage self-dischargeverified |
Sources: Unitree G1 Battery & Charger manual (via OpenELAB), retailer spec sheets. "Reported" values come from community documentation — confirm against your pack's nameplate.
The G1 has the best-documented battery in the humanoid industry. The official Battery & Charger manual specifies a 9,000 mAh, 421.2 Wh pack at 46.8 V rated — a quick-release module with Unitree's own battery management system handling balancing and protection.
The G1 ships with two batteries and a 54 V / 5 A fast charger; a full charge takes roughly 1.5 hours to 80%. At 421 Wh the pack ships as UN3480 Class 9 hazardous goods — any seller shipping you a G1 battery should be following lithium battery transport rules.
Buy OEM here. The BMS handshake is G1-specific, and third-party packs without it risk confusing the power system — or worse. Used buyers: ask for a capacity test readout and check the pack for swelling before paying.
Always match the exact model and revision — Unitree packs are not interchangeable across models. Buy OEM wherever possible; the battery management handshake is model-specific. For installation help, find a technician experienced with Unitree hardware.
Check current listings from sellers, or look up the official charging guidance before you buy.
Check Flip listings Read the manualThe verified specs are in the table above.
Batteries are the riskiest component to go third-party on — wrong voltage, missing BMS communication, or poor cells can damage the robot or create a fire hazard. OEM packs are strongly recommended.
Runtime drops well below the original spec, the robot shuts off under load despite showing charge, the pack swells or runs hot, or charge times stretch far longer than when new. A swollen pack is a safety issue — stop using it.