X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=power%2Fbattery%20tester%2Findex.org;fp=power%2Fbattery%20tester%2Findex.org;h=0000000000000000000000000000000000000000;hb=19af345819ef415d6685de55eb218367baa47b33;hp=6e61e4fa54d1f012133f5bc65ae3feabe4081300;hpb=365f953bb4a379fb74f7ec49244484f75362c684;p=physical.git
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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:
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* 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.