Great little device. Just mounted 4 units on an old piece of wood with a 4 way 18650 battery holder to make a 4 cell discharger. Each Battery Capacity Tester shows Amp-hour, Amps & Voltage of the cell in sequence as the process takes place. The resistor's do get hot, so do not touch them and keep them away from anything that could melt when in use. The 7.5 ohms resistor supplied causes a 0.5 amp load on a 3.6v 18650 battery.

Great little device. Just mounted 4 units on an old piece of wood with a 4 way 18650 battery holder to make a 4 cell discharger. Each Battery Capacity Tester shows Amp-hour, Amps & Voltage of the cell in sequence as the process takes place. The resistor's do get hot, so do not touch them and keep them away from anything that could melt when in use. The 7.5 ohms resistor supplied causes a 0.5 amp load on a 3.6v 18650 battery.

Great little device. Just mounted 4 units on an old piece of wood with a 4 way 18650 battery holder to make a 4 cell discharger. Each Battery Capacity Tester shows Amp-hour, Amps & Voltage of the cell in sequence as the process takes place. The resistor's do get hot, so do not touch them and keep them away from anything that could melt when in use. The 7.5 ohms resistor supplied causes a 0.5 amp load on a 3.6v 18650 battery.

Does one thing and does it well. I've used it to test 18650 Li-Ion cells and NiMH cells. Simply measuring open circuit voltage, or voltage under load will not find weak cells. This unit measures the cell Capacity in mAh (milliAmp hours) at whatever C-rate (amperes) draw you choose. The unit came with a 7 ohm 5W resistor, which tests LiIon cells at just under .5 amps. By switching to a 1.2 ohm resistor I changed that to 2.4A. That is about a 1-C drain for a 2400mAh 18650, allowing the test to complete in ~1Hr. You will want several different resistors for different voltage batteries and different C-rates. With a simple resistive load like this, the current falls slightly as the battery is discharged. (A better, more expensive unit would maintain a constant current.) But this does not affect the accuracy of the capacity measurement. The best 18650 cells I tested measured 2200mAh. Some older ones were between 600-1100mAh. Those are still usable. The worst cells measured 50-150mah. But they would still charge to 4.2V. You need a capacity tester like this allowed me to spot those and replace them. Also, I had a few 'UltraFire' '4500mah' cells I had foolishly bought on ebay a few years back. They measured less than 200mAh. Total crap.

Does one thing and does it well. I've used it to test 18650 Li-Ion cells and NiMH cells. Simply measuring open circuit voltage, or voltage under load will not find weak cells. This unit measures the cell Capacity in mAh (milliAmp hours) at whatever C-rate (amperes) draw you choose. The unit came with a 7 ohm 5W resistor, which tests LiIon cells at just under .5 amps. By switching to a 1.2 ohm resistor I changed that to 2.4A. That is about a 1-C drain for a 2400mAh 18650, allowing the test to complete in ~1Hr. You will want several different resistors for different voltage batteries and different C-rates. With a simple resistive load like this, the current falls slightly as the battery is discharged. (A better, more expensive unit would maintain a constant current.) But this does not affect the accuracy of the capacity measurement. The best 18650 cells I tested measured 2200mAh. Some older ones were between 600-1100mAh. Those are still usable. The worst cells measured 50-150mah. But they would still charge to 4.2V. You need a capacity tester like this allowed me to spot those and replace them. Also, I had a few 'UltraFire' '4500mah' cells I had foolishly bought on ebay a few years back. They measured less than 200mAh. Total crap.

Does one thing and does it well. I've used it to test 18650 Li-Ion cells and NiMH cells. Simply measuring open circuit voltage, or voltage under load will not find weak cells. This unit measures the cell Capacity in mAh (milliAmp hours) at whatever C-rate (amperes) draw you choose. The unit came with a 7 ohm 5W resistor, which tests LiIon cells at just under .5 amps. By switching to a 1.2 ohm resistor I changed that to 2.4A. That is about a 1-C drain for a 2400mAh 18650, allowing the test to complete in ~1Hr. You will want several different resistors for different voltage batteries and different C-rates. With a simple resistive load like this, the current falls slightly as the battery is discharged. (A better, more expensive unit would maintain a constant current.) But this does not affect the accuracy of the capacity measurement. The best 18650 cells I tested measured 2200mAh. Some older ones were between 600-1100mAh. Those are still usable. The worst cells measured 50-150mah. But they would still charge to 4.2V. You need a capacity tester like this allowed me to spot those and replace them. Also, I had a few 'UltraFire' '4500mah' cells I had foolishly bought on ebay a few years back. They measured less than 200mAh. Total crap.

this product is ORIGINAL 👍👌. But, packing quality was too ugly. it can measure up to 15volt and 3Amp. Max. i use it for measure li-ion cell capacity. it is measure very accurately. thanks a lot to shipper....

this product is ORIGINAL 👍👌. But, packing quality was too ugly. it can measure up to 15volt and 3Amp. Max. i use it for measure li-ion cell capacity. it is measure very accurately. thanks a lot to shipper....

this product is ORIGINAL 👍👌. But, packing quality was too ugly. it can measure up to 15volt and 3Amp. Max. i use it for measure li-ion cell capacity. it is measure very accurately. thanks a lot to shipper....

This module worked very well for building a 4 cell 18650 capacity checker. Easy to connect and operate. Being able to adjust the cut off voltage is a benefit. I recommend this product.

This module worked very well for building a 4 cell 18650 capacity checker. Easy to connect and operate. Being able to adjust the cut off voltage is a benefit. I recommend this product.

This module worked very well for building a 4 cell 18650 capacity checker. Easy to connect and operate. Being able to adjust the cut off voltage is a benefit. I recommend this product.

It does what it's supposed to do. Seems to give reasonable and repeatable results. I bought some 10W 3ohn resistors that seam to be perfect for 18650 testing.

It does what it's supposed to do. Seems to give reasonable and repeatable results. I bought some 10W 3ohn resistors that seam to be perfect for 18650 testing.

It does what it's supposed to do. Seems to give reasonable and repeatable results. I bought some 10W 3ohn resistors that seam to be perfect for 18650 testing.

its work perfectly

its work perfectly

its work perfectly

best banget deh

best banget deh

best banget deh

Thanks you very much very good product very fast delivery.

Thanks you very much very good product very fast delivery.

Thanks you very much very good product very fast delivery.

Awesome product, I'm happy with that

Awesome product, I'm happy with that

Awesome product, I'm happy with that

Plan to make a four 18650 cell capacity tester with this discharge module (not complete yet). Can only test one cell per module. Have more on order so a set of four can be tested at once. The + - terminals on the under side will be used to power the module instead of the USB. Pleased with this purchase.

Plan to make a four 18650 cell capacity tester with this discharge module (not complete yet). Can only test one cell per module. Have more on order so a set of four can be tested at once. The + - terminals on the under side will be used to power the module instead of the USB. Pleased with this purchase.

Plan to make a four 18650 cell capacity tester with this discharge module (not complete yet). Can only test one cell per module. Have more on order so a set of four can be tested at once. The + - terminals on the under side will be used to power the module instead of the USB. Pleased with this purchase.