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PX400 Battery Adapter for Pentax Spotmatic SP & Fujica ST

PX400 Battery Adapter for Pentax Spotmatic SP & Fujica ST

Regular price €19,95
Regular price Sale €19,95
incl. VAT · free shipping Currently not shipping to the USA: 2x adapters & batteries; Refill pack: p312 batteries; Spotmatic set: adapter & batteries + light seal + coin tool. Why?🟢 In stock · 26,000+ customers since 2019

Fits:

Pentax Spotmatic SP, SP-II, SP-IIA, 1000 and 500, Fujica ST601, ST701 & more. See all models

Type

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  • The right voltage for your meter: Under load, the P312 zinc-air cells put out a steady 1.4V or so, only slightly more than the 1.35V the light meter in older Spotmatics and Fujicas was designed for.
  • Replaces the discontinued mercury cell: The original mercury batteries are no longer sold, and modern 1.5V alkalines give you inaccurate meter readings.
  • Sits snugly in the battery compartment: The included rubber ring centers the smaller cell and makes contact, so it doesn’t rattle around loose in the chamber.

Compatibility

Fits a wide range of cameras, including:

  • Fujica: ST601, ST701 [...]
  • Honeywell: Spotmatic 1000, Spotmatic 500, Spotmatic SP, Spotmatic SP-II, Spotmatic SP-IIA [...]
  • Pentax: Spotmatic 1000, Spotmatic 500, Spotmatic SP, Spotmatic SP-II, Spotmatic SP-IIA [...]

Not sure whether this battery fits your camera? Here’s a complete list of all cameras that take the PX400 battery type.

What's included

2x Adapters & Batteries

  • 2x centering ring (rubber)
  • 6x zinc-air battery, type P312

Refill Pack: P312 Batteries

6x zinc-air battery, type P312

Adapters Only: No Batteries

2x centering ring (rubber), no batteries (you’ll need P312 zinc-air batteries, sold as size 312 hearing aid batteries at drugstores and pharmacies)

Spotmatic set: adapters & batteries + light seals + coin tool

  • 2x centering ring (rubber)
  • 6x zinc-air battery, type P312
  • 1x light seal kit for SLRs (single kit for 1-2 cameras, with mirror bumper foam)
  • 1x battery cover tool

The coin tool fits the Spotmatic SP and SP 1000. We haven’t tested it on the SP II, SP IIa or SP 500.

Technical details

  • Material: rubber (O-ring)
  • Battery type: P312 zinc-air only, not for LR41 (alkaline) or SR41 (silver oxide)
  • Voltage: approx. 1.4V (under load)
  • Replaces: PX400 / EPX400 / V400PX
  • SKU: 1032

Description

Your Pentax Spotmatic needs a battery that delivers a constant 1.35 V, and from the factory that meant a mercury cell. Those cells are no longer on sale, so this set mechanically adapts P312 zinc-air hearing aid batteries to the size the camera needs: a rubber centering ring holds the smaller cell in the battery compartment, and under load it puts out a steady 1.4 V or so, only slightly more than the 1.35 V the light meter was designed for. It fits the Fujica ST601 and ST701 just as well.

Electrically, the zinc-air cells are a direct replacement for the old PX400, EPX400 and V400PX types. Your light meter reads correctly without you having to adjust the camera. The rubber ring takes care of the contact.

Note: zinc-air batteries are activated by peeling off the seal. Wait about a minute before putting them in your camera.

Frequently asked questions

Why not a regular 1.5 V alkaline? Alkaline cells start out at 1.5 V and drop off over their life. The Spotmatic’s light meter is designed for a constant 1.35 V and gives incorrect readings with alkalines.

How do I activate the zinc-air cells? Peel off the seal, wait about a minute, then put them in the camera.

What’s included in the set? The “2x adapters & batteries” option contains 2 rubber centering rings and 6 P312 zinc-air batteries. The refill pack contains 6 batteries without rings.

Which battery types does the set replace? PX400, EPX400 and V400PX.

Download the instructions as PDF (German and English)

Show full details

Customer reviews

5.0 out of 5

Based on 8 reviews87% verified reviews

Transparency: Every customer who reviews an item bought from us receives a discount code for their next order, regardless of the star rating.

  1. Jonas L.Verified purchase

    Passt perfekt und funktioniert einwandfrei in meiner Pentax Spotmatic SP!

  2. BjörnVerified purchase

    Batterie hat funktioniert

  3. Bart D.

    Reviving my first SLR

    I bought these to be able to use my Pentax SP500 again after a period of more than 20 years.
    These work really well. Simple and efficient 👍

  4. HPWVerified

    Bestellt
    Geliefert
    PASST!
    Jederzeit wieder.

  5. Helmut S.Verified

    Alles super

  6. Klaus G.Verified

    Einwandfreie Lieferung!!!!!

  7. Thomas G.Verified

    Und es hat funktioniert!

    Alles bestens, der Belichtungszeiger schlägt aus. Danke. Hier gibt es tolle Angebote.

  8. SebastianVerified

    Sehr schnelle Lieferung. Artikel wie beschrieben. Gerne wieder.

Transparency: Every customer who reviews an item bought from us receives a discount code for their next order, regardless of the star rating. “Verified purchase” means the review came through the review link of an order in our shop. How we collect and check reviews

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