Acid Jar Battery (Wind-Powered Electrolyte Container)

The wind-powered acid jar battery is introduced by Norna as the colony’s historical energy source, abandoned due to fuel depletion and the planet’s environmental constraints. Tegan immediately grasps its potential as a power source for the mu-field activator, catalyzing a high-risk retrieval mission to the research room where it is stored.

Before: Located in the research room, inert due to lack of fuel and colony-wide power failure; its potential forgotten under institutional pressure

After: Still inert but designated as the group’s only viable energy solution, now targeted for dangerous retrieval

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S21E7 · Frontios Part 1

Weighing risky TARDIS repair options

Norna introduces the wind-powered acid jar battery as a functional relic, describing its capacity to charge low-voltage systems. The device’s potential becomes critical as Turlough imagines using a crude interrupter to spike its output for the mu-field activator. Its glass-encased fluid and copper electrodes represent both survival and temporal regression.

Before: Inert glass jar of murky electrolyte housed in the research room, previously charged by colony’s wind turbines

After: Activated as a battery under pressure, its acid etching the workbench while carrying the colony’s last hope for restoring power

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S21E7 · Frontios Part 1

Acid jar mission proposed and launched

Norna identifies the obsolete acid jar battery—previously charged by wind turbines—as a potential power source despite its primitive design and long disuse. Tegan and Turlough immediately commit to retrieving it from the restricted research room.

Before: Idle and inert in the research room’s cluttered storage after years of wind turbine neglect.

After: Still inert but now targeted for retrieval, signaling its transition from museum piece to desperate tool.

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S21E7 · Frontios Part 1

Retrieving the acid jar battery

The heavy wind-powered acid jar battery is the focal point of the group’s effort, being carried manually between Tegan and Norna as they navigate the cramped research room. Its wires and copper coils sway with each movement, emphasizing its precariousness. The battery’s hazardous contents emit a noticeable, toxic odor, filling the air and underscoring the urgency of careful transport.

Before: Positioned upright in the research room, connected to wind turbines via crude wiring, but inert due to power loss — inert but still dangerous due to contents

After: In the process of being transported toward an undetermined safer location using improvised assistance

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S21E7 · Frontios Part 1

Acid spill in research room

The wind-powered acid jar battery is being hoisted through ventilation piping when the jar's angle shifts unexpectedly. The sudden tilt causes the jar to tilt over, spilling its corrosive yellow fluid directly onto the colony's weakened floor plating below. This results in the rapid creation of a damaging chemical reaction that pierces the structural integrity.

Before: Suspended in crude rope rigging above ventilation openings, charged electrolyte fluid visible within cracked glass container.

After: Partially emptied of fluid with container now cracked further, exposing dripping acidic residue onto compromised floor area.

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S21E7 · Frontios Part 1

Container lifted past approaching guards

The heavy wind-powered acid jar, once a source of potential energy for the colony’s medical systems, becomes a physical distraction tool. Turlough and Tegan jointly maneuver it through the hatch in a desperate bid to create a momentary barrier or diversion against the approaching guards.

Before: Functionally inert following the colony’s energy collapse, left cracked and stored against the hatch wall, awaiting potential reuse if power returned.

After: Successfully moved through the hatch to a position where its disruptive potential might be triggered by an external force or manual adjustment.

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S21E7 · Frontios Part 1

Acid jar shatters on Orderly

The Wind-Powered Acid Jar Battery is being carefully lowered from the colony ship’s upper hatch by Turlough using a rope system. Its weight and fragility demand constant vigilance. The jar slips from control during the tense standoff with the Orderly and crashes directly onto the Orderly below, shattering on impact and drenching him in corrosive fluid.

Before: The acid jar is intact and suspended from a rope or chain, being carefully lowered from the hatch. Its murky yellow fluid bubbles faintly within cracked glass.

After: The jar is shattered on the ground, its corrosive contents spilled across the Orderly and the landing area, rendering it inert but having caused immediate physical harm.

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S21E7 · Frontios Part 1

Comrades carry stolen power through bombardment

Salvaged from the sealed research room despite Brazen's military guard, this power cell is immediately recognized by Norna for its potential to energize lighting systems. It becomes a contested asset as Brazen and Plantagenet suspect its theft as part of the Doctor's alleged sabotage.

Before: Secured and guarded in the sealed research room, intended for colonial lighting repairs before the energy collapse

After: Transported inside the medical facility for potential use

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S21E7 · Frontios Part 1

Colony guards find wounded Warnsman

The acid jar battery is identified as critical to restoring lighting in the medical centre. Norna and companions carry it forward as a solution to Frontios’ energy collapse while the Doctor immediately directs its use inside.

Before: Inactive after the colony’s energy collapse; lifted by Tegan as a possible power source

After: Transported to the medical centre and handed to the Doctor for urgent deployment

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S21E7 · Frontios Part 1

Meteorite strike amplifies accusations against the Doctor

The wind-powered acid jar battery, carried by Norna and other girls, is recognized by the Doctor as critical to restoring lighting in the colony medical center. It is immediately ordered inside for use, symbolizing the colony’s last viable technical resource.

Before: Energized by wind turbines but compromised by colony energy collapse, now physically carried as a portable power source

After: Taken inside the medical shelter for immediate deployment

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S21E7 · Frontios Part 1

Norna and Range handle acid jar battery

The wind-powered acid jar battery, a glass vessel filled with bubbling murky fluid and copper coils, is the central focus of their careful maneuvering. Its fragile glass cracks slightly under the pressure of the meteorite storm while its voltage remains the colony’s best chance to power essential repairs.

Before: A weathered and dented glass jar containing murky yellow fluid and coiled copper electrodes, its battery powered by wind turbines whose energy feed has faltered due to colony-wide energy collapse

After: Slightly more stabilized but still precariously positioned with visible stress cracks in the glass from rough handling during the crash-landing

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Appearances in the Narrative