First the value is hard to beat, four batteries and a charger for ~$15. The batteries had a fairly consistent size measuring in at 24.1-24.3mm wide, 41.5-42.0mm long and 7.3-7.5mm thick. The battery charger gets a little warm, not that bad when charging with a 2.1A port. The charger itself looks fairly durable, but the USB cable to 3/32" (2.5mm) plug is a bit cheep.and flimsy. IMO they should have at least used a cheap flimsy USB to micro USB cable, that way users typically have literally dozens of spares laying around should this one get misplaced or damaged. I typically just toss the cheap ones in a pile and use one of my higher quality spares anyway. I checked the voltages after letting the batteries sit for 2hrs after a charge. I used a Fluke 87 Series III that has recently been calibrated and they were 4.21 - 4.22V. Just a tad high, but not too bad. I haven't done any flight time comparisons as of yet to see if there are possibly any duds, but I haven't notice any significant differences yet.

First the value is hard to beat, four batteries and a charger for ~$15. The batteries had a fairly consistent size measuring in at 24.1-24.3mm wide, 41.5-42.0mm long and 7.3-7.5mm thick. The battery charger gets a little warm, not that bad when charging with a 2.1A port. The charger itself looks fairly durable, but the USB cable to 3/32" (2.5mm) plug is a bit cheep.and flimsy. IMO they should have at least used a cheap flimsy USB to micro USB cable, that way users typically have literally dozens of spares laying around should this one get misplaced or damaged. I typically just toss the cheap ones in a pile and use one of my higher quality spares anyway. I checked the voltages after letting the batteries sit for 2hrs after a charge. I used a Fluke 87 Series III that has recently been calibrated and they were 4.21 - 4.22V. Just a tad high, but not too bad. I haven't done any flight time comparisons as of yet to see if there are possibly any duds, but I haven't notice any significant differences yet.

First the value is hard to beat, four batteries and a charger for ~$15. The batteries had a fairly consistent size measuring in at 24.1-24.3mm wide, 41.5-42.0mm long and 7.3-7.5mm thick. The battery charger gets a little warm, not that bad when charging with a 2.1A port. The charger itself looks fairly durable, but the USB cable to 3/32" (2.5mm) plug is a bit cheep.and flimsy. IMO they should have at least used a cheap flimsy USB to micro USB cable, that way users typically have literally dozens of spares laying around should this one get misplaced or damaged. I typically just toss the cheap ones in a pile and use one of my higher quality spares anyway. I checked the voltages after letting the batteries sit for 2hrs after a charge. I used a Fluke 87 Series III that has recently been calibrated and they were 4.21 - 4.22V. Just a tad high, but not too bad. I haven't done any flight time comparisons as of yet to see if there are possibly any duds, but I haven't notice any significant differences yet.

Had no time to test if the batteries really do change in volume after some charges.Yet their factory size is very good

Had no time to test if the batteries really do change in volume after some charges.Yet their factory size is very good

Had no time to test if the batteries really do change in volume after some charges.Yet their factory size is very good