ALLOSUNBattery Internal Resistance Meter/Battery Voltage Tester/Digital Battery Analyzer CECOMINOD062345

When I first time use it, like other people said, it was not not accurate, and reading number was jumping.However, I realized the meter is a AC meter, thus it might be sensitive to environment Electromagnetic interference. So I turned off the lights on my desktop, and guess what happened: Reading number became fixed.Now you understand, the manufacture saved the money, and didn't do the EMI protection. However, the work around is so simple, that instead of purchasing a much expensive one, which might has EMI protection, I would like to pay less for just this one.

My first specimen lasted two and one half years, until it went kaput overnight. I was using it as usual one day, and at very next day, it was no longer a resistance meter. As failed, in all three resistance/impedance ranges: it would display a two digit number when open circuit (should be 'I' for infinity); and a three digit number on a conducting resistor. Even on shorted test leads, it displayed a bogus three digit number, higher than open circuit's two digits.Its circuit board has four turnable adjustable things (trimpots maybe). Having nothing to lose, I played with all four miniature dials: three didn't seem to do anything, and one of them tweaked least significant digit up and down by one count. (I don't remember which function was affected, volt or ohm.)I looked at it this way: thirty dollars spent for a tool which served two and one half years, is like twelve USD per year for rent/functionality. And it didn't become completely useless, just disabled: it is still a handy battery potential tester, a 50 V D.C. voltmeter. Every home should have a basic multimeter at this twenty-first century, but as most still don't: there is vacancy for battery potential meters, to be filled by these failed battery impedance testers. Pattern failure in this model of appliance is not an urgent escalating e-waste problem.While I am upset because it failed and doesn't seem easily fixable, I was satisfied enough with it, to order another. I did consider other options, and decided to just buy another one of these. My second specimen was dead on arrival: in a different way from how my first failed, this new-DOA was also only a DC-voltmeter. This DOA specimen displayed every resistance/impedance as zero. 0 Ω, in all three ranges. Ships from Amazon.com Sold by Amazon.com Customer Service Amazon.com, it was replaced five days later. This replacement (my third specimen) worked on arrival, but it lasted only two days. Two days after first use, it failed just like second specimen: measures anything as bogus 0Ω.I was completely satisfied with this measurement instrument, when it lasted two and one half years. Receiving two bad units in a row (one dead on arrival, one dead after two days) is not bad luck. There is a real problem here: either a major design oversight, or practically inexistent quality assurance.If I were Amazon.com: I would stop sale immediately and test each and every unit in inventory. If I were all-sun (Eastern Intelligent Meter Co.): I would retire the model EM3610, "go back to the drawing board" and re-engineer it. I want to see a new, hardness improved, model EM3611 Battery Internal Resistance Meter, with three year warranty.

I agree with three other reviewers. This meter is junk. Quality control was non-existent. The meter never worked, straight out of the box. Once a (verified good) battery is installed, the meter cycles through random numbers for about 5 seconds and then locks up displaying either 1 or-1. This happens on all switch positions, both volts and ohms. Turning the meter off does not reset the electronics. The meter will read 1 or -1 immediately after turning back on. I can reset the meter by disconnecting the battery and re-connecting it, but it again displays random numbers for about 5 seconds before permanently locking up again. This product is trash, and I will be returning it to Amazon for a refund.

Not completely accurate, but workable

This is an excellent 4 wire Kelvin battery impedance meter for the money. Nice LCD display. Works as advertised. I use a Lacrosse BC-700 for charge and capacity tests and this meter for battery internal impedance tests. This allows sorting and matching of AA flash batteries for minimum photography flash recycle time. For more stable readings, put the battery in a good metal battery holder and measure the impedance across the battery holder terminals.The meter does indicate a 1 when it is out of range, which is typical for all meters of this type.An instruction manual in English would be an improvement. Amazon provided the manual in English when requested.

Very nice accurate way for me to monitor my lipo batteries. However the manual was entirely in Chinese. I sent an email to All-Sun requesting an English manual but received no reply. A manual would be nice as well as an explanation of the concept of operation.

I studied electrochemistry of fuel cells and batteries during my PhD and I have found this meter to be an incredibly valuable tool for the cost. These meters are typically from $2-5k USD for a precision one that performs the same operation. I found the accuracy for low IR cells was pretty darn close, but just a little higher than precision tools. However, for the cost of this meter, it performs very well and will be found very helpful to the battery and electronics community (despite the 1 star rating from a commenter who clearly lacks depth of understanding and appreciation for this).

The Internal Resistance Meter showed that every 12v battery I tested had zero internal resistance. Good batteries, new batteries, old batteries, and bad batteries. I ordered a replacement and it also has the same problem. It never gives usable readings for any 12 volt battery tested. Now I have 2 to return. I bought a 3rd Internal Resistance Meter from another seller and it works great, but at a somewhat higher price. The Allosun Battery Internal Resistance Meter is useless.

A tool for measuring battery quality. well

I've used it a lot and there is a problem like any other handheld solutions. The readings changes depending on the force you put on the battery tabs. A small change in pressure will give a difference big enough to matter when making a diy battery pack.Though, the reading are pretty stable and seems to be repeatable between a couple of readings. The screen is clear and it seems to be built though.

ラインが短く測定し辛いのが難点。取り扱い説明書が、欲しい所です。極性を合わせないと、内部抵抗が異なるので注意が必要は見たいですヨ!