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