Unitree B2 Battery
Genuine Unitree B2 battery — BT2-10 standard pack, 45000mAh (2268Wh), the factory-fit pack for the B2 and the largest in the BT2 series.
- Unitree B2
About the Unitree B2 Battery
The Unitree B2 battery is the official quick-swap power pack for the B2 quadruped, and it comes in three versions built for very different working conditions. The BT2-10 is the standard pack that ships with every B2 and carries the largest capacity in the BT2 series. The BT2-11 is the cold-weather version that ships with the wheeled B2-W and keeps charging where other packs have to stop. The BT2-12 is the high-temperature version for steel mills, desert deployments and Middle East summers, with fast charging that refills it in about an hour.
All three versions share the same 50.4V platform and the same plug-in bay: a pack slides out and a fresh one drops in without tools, so a B2 can keep a crew working through a shift on rotating batteries. Capacity spans 45000mAh (2268Wh) on the BT2-10, 40500mAh (2041.2Wh) on the BT2-12 and 37800mAh (1852.2Wh) on the BT2-11 — the trade-off for the BT2-11's smaller size is a charging window that reaches 20 degrees below zero. Every figure on this page follows Unitree's official BT2 specification.
Choose the version that matches your robot and your worksite: BT2-10 as a like-for-like spare for a standard B2, BT2-11 for winter operations and every B2-W, and BT2-12 where heat and turnaround time dominate. Running mixed conditions? Many fleets carry BT2-10 for everyday rounds and a BT2-11 for the cold season — both fit the same B2.
Which Unitree B2 Battery Should You Choose — BT2-10, BT2-11 or BT2-12?
All three versions fit the same B2 battery bay, so the choice is about your robot model and your worksite temperature, not about compatibility gymnastics. The standard B2 accepts every version; the wheeled B2-W is built around the BT2-11 and should not run the BT2-10.
- Choose the BT2-10 if you run a standard B2 and want the like-for-like factory pack: the largest capacity in the BT2 series and the strongest all-round range per swap.
- Choose the BT2-11 if you operate a B2-W, or if your B2 works through freezing conditions — it keeps charging at ambient temperatures down to -20°C, where the other versions have to warm up first.
- Choose the BT2-12 if heat and turnaround dominate your operation: steel mills, desert and Middle East deployments, plus fast charging that refills the pack in about an hour with the B2 fast charger.
Which Robot Does Each B2 Battery Version Fit?
The legged B2 and the wheeled B2-W share the same battery bay but ship with different factory packs. The matrix below shows how each version pairs with each robot as delivered from the factory — and the one combination to avoid.
| Standard BT2-10 | Cold-Weather BT2-11 | High-Temp BT2-12 | |
|---|---|---|---|
| Unitree B2 (legged) | Factory fit | Fits | Fits |
| Unitree B2-W (wheeled) | ✗ Not recommended | Factory fit |
Specifications
| Standard | Cold-Weather | High-Temp | |
|---|---|---|---|
| Model No. | BT2-10 | BT2-11 | BT2-12 |
| Weight | ≈12.2 kg | — | — |
| Rated voltage | DC 50.4V | DC 50.4V | DC 50.4V |
| Charge limit voltage | DC 58.8V | DC 58.8V | DC 58.8V |
| Rated capacity | 45000 mAh · 2268 Wh | 37800 mAh · 1852.2 Wh | 40500 mAh · 2041.2 Wh |
| Discharge temperature | -20°C to +50°C | -40°C to +60°C | -40°C to +80°C |
| Charge temperature | 0°C to +40°C | -20°C to +60°C | 0°C to +70°C |
| Fast charging | — | — | Supported with the B2 fast charger — full charge in about 1 hour |
| In the box | 1 × Unitree B2 Battery BT2-10 | 1 × Unitree B2 Battery BT2-11 | 1 × Unitree B2 Battery BT2-12 |
Shipping, Quality & Battery Care
We ship lithium batteries worldwide in UN38.3-compliant packaging via DHL or FedEx. Battery-only parcels travel as regulated air cargo, so delivery can take a few days longer than standard shipments; we confirm the exact transit time with your quote.
Every Unitree B2 battery is 100% quality-inspected before it ships, so it arrives in perfect working order. Store spare packs off the robot in a cool, dry place away from direct sunlight, and top them up before returning them to storage after long deployments.
Last updated: October 2026.
Frequently Asked Questions
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