The easiest is a battery internal resistance testers:
http://www.joyfay.com/us/battery-internal-resistance-impedance-meter-tester-dy2501.html?gclid=CNbUi5Ta47UCFQuqnQodFBgAxQ
or
http://www.ebay.com/itm/Internal-Battery-Resistance-Impedance-Meter-Tester-Z-/160504165351#vi-content
You can test "in-situ" using a volt meter, an ammeter, and a dummy
load (like your heater), and a calculator. Two load conditions
= two voltages, two amperages = gets you the slope of the load line
which is a pretty good estimate of internal resistance.
(V1 - V2)
--------------- = R
(I1 - I2)
Bill D.
At 11:12 AM 3/4/2013, you wrote:
measuring ohms LiFePO4
is there some way to do this with a standard vom and resistor or something ?
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