Скачать или смотреть NEW! PolaVolt How-to: The cheapest & best i-Type Battery mod for SX-70 cameras!

Essential info:

uses two 3.7V '10440' lithium ion cells (same shape and size as a regular AAA but different voltage)
batteries are hard cell and user replaceable in the field
requires external charger such as the BH-042100-04U to recharge the batteries
batteries will last 10-30 packs of film depending on the quality of battery and specifics of the camera model
no switches required! simply erect the camera to turn it on, and collapse the camera to turn it off
keep camera collapsed when not in use to prevent battery draining to 0V
when the batteries are getting low, the camera will begin to sound sluggish, alerting you to change your batteries
I recommend re-charging them every 8 or so packs of film if you want to be conservative
user replaceable cells mean you can carry spares into the field!
despite some doubts in this older video, this solution does works perfectly on a 680
due to shipping regulations I cannot supply batteries, but they are easy to find on eBay, Amazon, Aliexpress etc
as tempting as they are, do NOT use the batteries with built in USB-C charging inside the cell itself. They are only 2/3 the capacity of a standard 10440 and have built in surge protection that will shut the batteries off if too many amps are drawn. This results in poor performance

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If you are a technician offering such a service commercially, please credit it as being invented by The Instant Camera Guy. This is all I ask :)

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Previous PolaVolt videos:
   • The Cheapest (And Best?) SX-70 i-Type powe...  
   • HOW TO: Wire up the PolaVolt i-Type Batter...  

Parts list:
your SX-70!
1x enclosed 2xAAA battery holder
2x AAA sized '10440' 3.7V lithium ion batteries (350mAh or so)
1x mini buck converter
good quality solder and soldering iron
heat shrink
kapton tape
automotive body moulding tape
1x 3.7V lithium ion battery charger

Optional:
1x 0805 size SMD resistor around 45K to 47K in value (outputting 6.05 to 6.2V respectively on buck converters using a MP2307 chip. Note that bucks based on other chips may need different resistor values, and if you are unsure you should ALWAYS check the output voltage before finishing wiring it up)

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Like all battery adapters on the market, it has it's pros and cons, but the price is right!

Pros:
uses entirely off-the-shelf components
very powerful
compact
simple design, with no built in charging circuitry to fail, all charging happens externally
hard cell battery design means batteries are user-replaceable and field-replaceable
automatic darkslide eject is disabled
cheap!
battery lasts for many many packs of film. I'd recommend topping up the batteries after 10-15 packs.

Cons:
yes, it still adds 'bulk' like the other battery adapters do, but is one of the most compact solutions possible
kinda ugly? But also not really. Its very neat for what it is
this mod is not really the kind of thing the average user can install, but easy for a technician like me to do while I'm overhauling the camera
on strap-lug models such as the Alpha and Sonars, the right strap lug is very SLIGHTLY obscured, making it SLIGHTLY harder to attach a strap.

Please note that you MUST get the 10440 cell that looks EXACTLY like a AAA. With one protruding and and one flat end.


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Chapters:

00:15 - Intro
01:30 - What is a PolaVolt?
02:22 - PolaVolt vs other i-Type adapters
05:11 - A message to technicians. If you are going to copy me, do it properly!
08:58 - What you need
15:30 - Disabling auto eject
18:23 - Removing battery terminals
20:22 - Modifying the ribbon cable
32:37 - An optional step
35:00 - Modifying and fitting the bottom body panel
43:25 - Forgot to mention... You need to mod the battery holder
45:35 - Prepping the buck converter
46:34 - Soldering in the buck converter
50:45 - Installing the buck converter
54:41 - The finished camera


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