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Measures correctly, easy to use, detects discharge shut-off voltage automatically according to battery type. Those ceramic resistors get quite hot when discharging 12 V batteries, might want to use something different as load.
Verified purchase: Yes | Condition: New
I bought this item to check the capacity for various (LiPo / Pb) batteries. I was a little skeptical at first but I've checked with an external meter and this item is quite accurate. Displays voltage, discharge current and capacity with 1 mAh resolution (to 10 Ah, then 10 mAh resolution and so on). I've compared also with a professional discharger and found that this item gave the same results. Cut-off voltage is selectable. It determines the cut-off voltage automatically depending on the battery / cell voltage, but you can adjust it yourself which is a nice feature. Only when you change the cut-off voltage during a discharge run, the capacity meter resets itself. So be sure to write down the capacity when changing the cut-off voltage! The resistors included are nice, but for a serious discharge I reccomend heavier types (around 20 to 50W depending on the voltage).Read full review
Verified purchase: Yes | Condition: New
Really like the product since it is so simple to use and takes automatic readings. It takes about 30 mA to run from 4 or 5V supply, so any USB charger should work fine to power it. An improvement I plan is to make a simple one transistor constant current source using the supplied 750 Ohm resistor. I plan to limit current drain to 100 mA which means it takes the device longer to determine battery capacity but should be more accurate. I manually measured 225 mAhr @ 100 mA on a battery and after recharging, with this device and the 750 Ohm resistor measured 205 mAhr, so it is decent in accuracy. I suspect the 500mA drain might have caused heating that lowered the capacity readout. One note is the micro USB connector is not rugged, so you might want to press with your thumb when inserting or removing the USB plug. I ended up soldering positive and negative power supply wires on the back of the board as a backup.Read full review
Verified purchase: Yes | Condition: New
This is a neat little discharge device. You can connect any DC battery/power source up to 15 volts, and any load you want, from appropriate wattage resistors, to your own electronics projects. When you press the "OK" button, this device will connect your source to your load and start monitoring and displaying the current and voltage to your load, and integrating/counting the Amp-hours. If/when the power supply voltage drops to a value you specify (to 0.1V resolution), the device will disconnect your load and indicate the total A-h delivered to the load. I mostly use it to discharge lipos to determine capacity, or to bring them down to storage voltage. Enjoy!
Verified purchase: Yes | Condition: New
i tested it on 3.7 lipo and if you know what you expect from it then its fairly good for its low price. keep in mind its can give you a good estimate of your battery capacity but it is not accurate . it is base on a fix resistor so the current drops as the battery voltage drop also the battery voltage read is less then the actual so it will stop test earlier (you can overcome this by setting the cutoff voltage) i used this for sensing the capacity of old laptop batteries so it is good for that
Verified purchase: Yes | Condition: New
