4 <title>AA and AAA battery tester</title>
5 <!-- 2020-05-24 P 23:55 -->
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197 <div id="content" class="container">
198 <div class="row"><div class="col-md-9"><h1 class="title">AA and AAA battery tester</h1>
200 <div id="outline-container-sec-1" class="outline-2">
201 <h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
202 <div class="outline-text-2" id="text-1">
204 <li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
205 COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
206 DESIGNS AT YOUR OWN RISK.
209 <li>This design is released under Creative Commons Zero (CC0) license.
214 <li>Svjatoslav Agejenko
216 <li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
218 <li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
225 <li><a href="../../index.html">Other physical projects in this repository</a>
227 <li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
235 <div id="outline-container-sec-2" class="outline-2">
236 <h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
237 <div class="outline-text-2" id="text-2">
240 <p><img src="make.png" class="img-responsive" alt="make.png">
246 <p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
251 Simple rechargeable Ni-MH battery tester. The problem with those
252 batteries is: right after you take them out of charger, voltage level
253 at their terminals is good. But some old batteries will get
254 empty/discharged way too quickly under normal load. This device is
255 intended to discover old batteries with reduced capacity.
259 Freshly charged batteries are tested under high load for short time by
260 shorting battery + and - terminals using 5 ohm power resistor
261 (R1). Simultaneously battery voltage is being measured while under
267 <p><img src="electrical%20schematic.png" class="img-responsive" alt="electrical%20schematic.png">
272 I use vintage analog voltmeter. Instead of power resistor I use
273 Nichrome resistance wire. Test/measurement button should not be
274 pressed for long because power resistor gets hot quickly and battery
275 is being quickly depleted during measurement.
280 <p><img src="assembly.png" class="img-responsive" alt="assembly.png">
285 <li>Body: <img src="body.png" class="img-responsive" alt="body.png">
287 <li>Cover: <img src="cover.png" class="img-responsive" alt="cover.png">
292 <li><a href="bodyAndCover.FCStd">FreeCAD project</a>
294 <li><a href="body.stl">body STL file</a>
296 <li><a href="cover.stl">cover STL file</a>
301 <li>PS: While this device is interesting to build, still you can just
302 use ordinary ammeter that can handle battery generated current.
307 </div><div class="col-md-3"><nav id="table-of-contents">
308 <div id="text-table-of-contents" class="bs-docs-sidebar">
310 <li><a href="#sec-1">1. General</a></li>
311 <li><a href="#sec-2">2. Project description</a></li>
316 <footer id="postamble" class="">
317 <div><p class="author">Author: Svjatoslav Agejenko</p>
318 <p class="date">Created: 2020-05-24 P 23:55</p>
319 <p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>