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[physical.git] / power / battery tester / index.org

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-#+TITLE: AA and AAA battery tester
-#+AUTHOR: Svjatoslav Agejenko
-#+LANGUAGE: en
-
-* (document settings) :noexport:
-** use dark style for TWBS-HTML exporter
-#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
-#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
-#+HTML_HEAD: <style type="text/css">
-#+HTML_HEAD:   footer {background-color: #111 !important;}
-#+HTML_HEAD:   pre {background-color: #111; color: #ccc;}
-#+HTML_HEAD: </style>
-
-* General
-+ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
-  COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
-  DESIGNS AT YOUR OWN RISK.
-
-+ This design is released under Creative Commons Zero (CC0) license.
-
-+ Author:
-  - Svjatoslav Agejenko
-  - Homepage: https://svjatoslav.eu
-  - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
-
-+ See also:
-  - [[../../index.html][Other physical projects in this repository]]
-  - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
-
-* Project description
-[[file:make.png]]
-
-[[file:make,%202.png]]
-
-Simple rechargeable Ni-MH battery tester. The problem with those
-batteries is: right after you take them out of charger, voltage level
-at their terminals is good. But some old batteries will get
-empty/discharged way too quickly under normal load. This device is
-intended to discover old batteries with reduced capacity.
-
-Freshly charged batteries are tested under high load for short time by
-shorting battery + and - terminals using 5 ohm power resistor
-(R1). Simultaneously battery voltage is being measured while under
-load.
-
-[[file:electrical%20schematic.png]]
-
-I use vintage analog voltmeter. Instead of power resistor I use
-Nichrome resistance wire. Test/measurement button should not be
-pressed for long because power resistor gets hot quickly and battery
-is being quickly depleted during measurement.
-
-[[file:assembly.png]]
-
-+ Body: [[file:body.png]]
-+ Cover: [[file:cover.png]]
-
-+ Download:
-  + [[file:bodyAndCover.FCStd][FreeCAD project]]
-  + [[file:body.stl][body STL file]]
-  + [[file:cover.stl][cover STL file]]
-
-+ PS: While this device is interesting to build, still you can just
-  use ordinary ammeter that can handle battery generated current.