documenting battery tester
[physical.git] / power / battery tester / index.org
1 #+TITLE: AA and AAA battery tester
2 #+AUTHOR: Svjatoslav Agejenko
3 #+LANGUAGE: en
4
5 * (document settings) :noexport:
6 ** use dark style for TWBS-HTML exporter
7 #+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
8 #+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
9 #+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
10 #+HTML_HEAD: <style type="text/css">
11 #+HTML_HEAD:   footer {background-color: #111 !important;}
12 #+HTML_HEAD:   pre {background-color: #111; color: #ccc;}
13 #+HTML_HEAD: </style>
14
15 * General
16 + DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
17   COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
18   DESIGNS AT YOUR OWN RISK.
19
20 + This design is released under Creative Commons Zero (CC0) license.
21
22 + Author:
23   - Svjatoslav Agejenko
24   - Homepage: https://svjatoslav.eu
25   - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
26
27 + See also:
28   - [[../../index.html][Other physical projects in this repository]]
29   - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
30
31 * Project description
32 [[file:make.png]]
33
34 [[file:make,%202.png]]
35
36 Simple rechargeable Ni-MH battery tester. The problem with those
37 batteries is: right after you take them out of charger, voltage level
38 at their terminals is good. But some old batteries will get
39 empty/discharged way too quickly under normal load. This device is
40 intended to discover old batteries with reduced capacity.
41
42 Freshly charged batteries are tested under high load by shorting
43 battery + and - terminals using 5 ohm power resistor
44 (R1). Simultaneously battery voltage is being measured while under
45 load.
46
47 [[file:electrical%20schematic.png]]
48
49 I use vintage analog voltmeter. Instead of power resistor I use
50 Nichrome resistance wire. It gets hot quickly!
51
52 + Body: [[file:body.png]]
53 + Cover: [[file:cover.png]]
54
55 + Download:
56   + [[file:bodyAndCover.FCStd][FreeCAD project]]
57   + [[file:body.stl][body STL file]]
58   + [[file:cover.stl][cover STL file]]