Ako pán 
S tým ESR testerom ste niekto neskúšali merať? Ja jeden doma mám ale hlavne na testovanie elektrolytických kondenzátorov bez potreby ich odletovať z plošáku a nerád by som si ho dokaličil.
Čo by mal vedieť zistiť:
Citace: if you have access to an ESR meter put across the battery, internal resistance should be below 1 ohm on a good SLA battery [bezúdržbová autobatéria]. Internal resistance goes up as batteries go bad.
Citace: ESR =
= vnútorný odpor batérie
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(stav nabitia) umocnený na koeficient kapacity
http://www.bth.se/fou/cuppsats.nsf/all/ ... obczak.pdf
Toto vraví wikipedia:
Citace: A meter such as an equivalent series resistance meter (ESR meter) normally used for measuring the ESR of electrolytic capacitors can be used to evaluate internal resistance.[1] ESR meters fitted with protective diodes cannot be used, a battery will simply destroy the diodes and damage itself. An ESR meter known not to have diode protection will give a reading of internal resistance for a rechargeable or non-rechargeable battery of any size down to the smallest button cells which gives an indication of the state of charge. To use it, measurements on fully charged and fully discharged batteries of the same type can be used to determine resistances associated with those states.
Citace: The cost of an ESR meter makes it uneconomic for measuring battery voltages as its only function, but a meter used for cheeking capacitors can take on the additional duty.
Prečo to neskúšam:
Citace: An ESR meter may be damaged by connection to a capacitor with significant voltage across it, either because of residual stored charge or in a live circuit. Protective diodes across the input will minimise this risk, but then the meter can no longer be used to measure battery internal resistance.
Citace: If I tried to measure the impedance of a battery with my esr meter it would be seen as a charged capacitor and the automatic discharge would swing into action with disastrous results as it would not be able to cope with such a current. The magic smoke would out.
Ďalší múdry zdroj (http://amrita.vlab.co.in/?sub=77&brch=2 ... 1570&cnt=1):
Citace: The current is a function of the rate of chemical reaction in the battery, which is characterized by the Equivalent Series Resistance (ESR). Then from Ohm’s law, we can see that for a fixed voltage, the current is controlled by the resistance.
Current = Voltage / Resistance = V / ESR
The capacity of the battery is defined as
Capacity = (Voltage) * (Amp-hours).
Toto je tiež dobrý článok o batériách a zisťovaní ich stavu:
http://batteryuniversity.com/learn/arti ... resistance
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