controller system power cells batteries
It's no secret that keeping an autonomous, bipedal robot running for hours at a time requires some truly amazing power storage densities. Comparable technology from electric vehicle companies often weighs more than one of our units, and takes up far more space. Discover more about these amazing breakthroughs.
fuel cell Clean, efficient, safe hydrogen electrolysis. Proven as the medium of choice for interstellar probes and urban transit.
alkaline Conventional, low-cost chemical batteries that are easy to replace, quick to recharge, and offer great compatibility.
zinc-oxide cell High energy density and reliable voltage regulation suitable for embedded medical devices.
lithium-ion Lithium polymer storage offering twice the power density of an alkaline cell at half the weight.
metabolic Biochemistry based on the TCA cycle, fortified with nanotechnology to ensure full regeneration of enzymatic efficiency.
sonofusion Low-temperature hydrogen fusion based on acoustic cavitation, facilitated and stabilized by self-regenerating nanites.
uRTG Uranium-based radioisotope thermoelectric generation, offering unrivaled power output and longevity.
battery typecurrent part numberexpected lifetime before recharge*
uRTG Radioisotope Power Cell13-0002-I 49.44 hours
Nanite-Assisted Sonofusion Power Cell13-7027-A 24.72 hours
Nanite-Assisted Metabolic Power Cell13-0001-G 8.00 hours
Lithium-Ion Polymer Battery13-0536-D 4.00 hours
Boreas 6.1 Zinc-Oxide Fuel Cell13-2051-D 3.10 hours
Opaque Computing GN Alkaline BatteryOC-0093-25 2.07 hours
Regenerative Fuel Cell13-6022-G/CM62 1.03 hours
* Assuming constant draw rate of 780 W. Typical usage varies. For more information, see our Support site. (ARES, Companion).

Battery replacements: If your battery does not have a part number, or does not have one of the part numbers listed above, it is out of date and should be replaced. Authorized replacement agents are:

Responses are generally available within twelve hours depending on replacement agent availability. If possible, contact a replacement agent before updating your controller's firmware to avoid downtime. Current batteries are compatible with all older controller hardware.


Starting with Generation 3 batteries (see part numbers, above), all power cells have automatic positioning. Place the battery on the ground and use the Linden Lab Edit Tool to adjust the number in its object description, then re-insert the battery. The default value is -0.334. The ideal value is a function of the unit's chest depth. See Support Article 2235 for a complete guide on configuring this value.

Capacities and recharge times

batteryinitial capacityCharger 3.39000-series ARCACS CP-150cycles to max degradation
NS uRTG Radioisotope Power Cell (13-0002-I)138827520 J1052 sec964 sec9255 sec~3.6
NS Nanite-Assisted Sonofusion Power Cell (13-7027-A)69413760 J526 sec482 sec4626 sec
NS Nanite-Assisted Metabolic Power Cell (13-0001-G)22464000 J170 sec156 sec1498 sec
NS Lithium-Ion Polymer Battery (13-0536-D)11232000 J85 sec78 sec749 sec~1.8
NS Boreas 6.1 Zinc-Oxide Fuel Cell (13-2051-D/C)8700000 J66 sec60 sec580 sec
Opaque Computing GN Alkaline Battery (0093-25)5800000 J44 sec40 sec387 sec~1.8
NS Regenerative Fuel Cell 13-6022-G/CM622901600 J22 sec20 sec193 sec~1.1
NS Regenerative Fuel Cell 13-6022-G customvaries

All figures are presented under the assumption that the unit is not currently using any power. Most units require 478 W while recharging, which will increase the recharge times given above and slow the rate of degradation. See below for more details on degradation mechanics.


Degradation is calculated with:

degradation_base = incoming_power ^ 1.1
new_capacity = old_capacity - degradation_rate * degradation_base

The value for incoming_power is calculated after deducting the unit's current usage, so high power requirements during charging will slow the degradation of the battery (as well as charging.)

Degradation stops when capacity reaches 40% of original value.

Charger efficiencies

FRG Induction Charger series 3132 kW429172 J
FRG Induction Charger series 4*variesvaries
CPD Cartouche Charger*variesvaries
ARC 47-9000 series144 kW (288 kJ every 2 seconds)1012352 J
ACS CP-15015 kW (150 kJ every 10 seconds)493969 J
FSD series 12 wall outlets72 kW (14.4 kJ every 0.2 seconds)37514 J
ExARC 47-2600 series**NORMAL: 200 kW (200 kJ every 1 second)
ECO-MODE: 10 kW (10 kJ every 1 second)
NORMAL: 677849 J
ECO-MODE: 25119 J
* This model supports a wide range of charging speeds. ** The ExARC will gradually slow down over time and must be cleaned regularly, using the 'CLEAN CHAMBER' option from the 'SETTINGS' menu while the chamber is unoccupied.

Power output from standard WCN wireless charging varies based on distance. A single WCN can produce up to 5 kW every 5 sec, resulting in a degradation_base of no more than 11719 J. For a standard unit drawing 780 W, this is further reduced to 9724 J.

Rate of capacity loss

batterydegradation_rateFRG Charger 3.3.1ARC 9000-MACS CP-150
NS uRTG Radioisotope Power Cell (13-0002-I)0.0521458.6 J/sec25308.8 J/sec1961.85 J/sec
NS Lithium-Ion Polymer Battery (13-0536-D)0.1042917.2 J/sec50618 J/sec5061.8 J/sec
Opaque Computing GN Alkaline Battery (0093-25)0.1042917.2 J/sec50618 J/sec5061.8 J/sec
NS Regenerative Fuel Cell 13-6022-G series (incl. G/CM62)0.2085834.4 J/sec101236 J/sec10123.6 J/sec

WCN-based power level maintenance is strongly recommended for batteries shorter than 8 hours. Generation 4 batteries will reduce the rates for non-uRTG batteries by a factor of 10.


batterylosable capacityFRG Charger 3.3.1ARC 9000-MACS CP-150
NS uRTG Radioisotope Power Cell (13-0002-I)83296512 J3880 sec3290 sec42458 sec
NS Lithium-Ion Polymer Battery (13-0536-D)6739200 J157 sec133 sec1331 sec
Opaque Computing GN Alkaline Battery (0093-25)3480000 J81 sec69 sec688 sec
NS Regenerative Fuel Cell 13-6022-G/CM621740960 J20 sec17 sec172 sec
NS Regenerative Fuel Cell 13-6022-G customvaries