AA and AAA battery tester
+ +1 General
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- 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:
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- Svjatoslav Agejenko + +
- Homepage: https://svjatoslav.eu + +
- Email: svjatoslav@svjatoslav.eu + +
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+ - See also: + + +
2 Project description
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+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. +
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+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. +
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- Body:
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+ - Cover:
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+ - Download:
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- FreeCAD project + +
- body STL file + +
- cover STL file + +
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+ - PS: While this device is interesting to build, still you can just +use ordinary ammeter that can handle battery generated current. + +