AA and AAA battery tester
1 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: svjatoslav@svjatoslav.eu
- See also:
2 Project description
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 by shorting battery + and - terminals using 5 ohm power resistor (R1). Simultaneously battery voltage is being measured while under load.
I use vintage analog voltmeter. Instead of power resistor I use Nichrome resistance wire. It gets hot quickly!
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