Battery Capacity Tester

Battery Tester Assembly Top view
Battery Tester Version 2.2 Assembly top view

I found myself in need of a recharge­able bat­tery tester, so I went off to search the inter­net for a DIY tester.
I was pleas­ant­ly sur­prised to find that John Lowen, had built a Rechargeable Battery Capacity Tester (v2.0), and also devel­oped the PC inter­face soft­ware for desk­top use.
Even bet­ter I found that Paul V. had also built the same tester and had made sev­er­al improve­ment in the design and soft­ware.

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Another ESI 250 DE Universal Impedance Bridge

ESI 250 DE unit #2
ESI 250 DE unit #2 front pan­el

Everyone should have at least two of these ESI 250DE Impedance bridges.

Well that was not my first thought when pur­chas­ing this unit on Ebay.
I was still hav­ing some issues with the “Internal DC” detec­tor cir­cuit on my exist­ing unit, and the price of this unit was extreme­ly rea­son­able. After dozens of hours trou­bleshoot­ing the first unit with no solu­tion, my thought was to com­pare the two cir­cuits and sal­vage parts from the new unit if nec­es­sary.

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