Thunderheart Reviews

In Queen Battery's lineup QB18650-2500 stands very close to QB18650-2600 not only by capacity rating but also with max supported discharge current - the 2500mAh cell supports 5C or 12.5A and the 2600mAh one - 13A. So not only testing the 2500mAh cell is interesting but also comparison between them. The battery was bought from Queen Battery which is my reliable supplier of genuine cells and tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. This is the first test done using my battery holder v.4.0. A detailed video about it is available on my channel. I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hr pause. The environmen

A typical LFP or LiFePO4 cell has 3.2V nominal voltage which means that if you connect 4 LFP cells in series you’ll have a 12.8V battery pack. The charge end voltage for a 4S pack would be 4 × 3.65V= 14.6V but as you know battery packs need to be balanced to serve for a long time, especially if the cells have different internal resistance. HX-JH-004 is a balancer board for a 4S LFP battery pack which should not be confused with BMS – the latter also protects the battery pack from overcharging, overdischarging and going overcurrent. HX-JH-004 only does the balancing. Specifications of HX-JH-004 4S LFP balancer board ● Dimensions (LWH) : 26 ×20.5×2.4mm ● Balancing current for each cell : 58mA ● Balancing voltage for each cell : 3.60V (14.4V for the 4S Li FePO4 battery pack) So when a cell’s voltage goes above 3.60V the balancer shoud start discharging until it reaches the 3.60V limit. Let’s take a closer look at the components on the PCB. There are 4 cha

Sanyo UR18500FK is a 1700mAh rated 18500 cell capable of giving up to 3.24A continuously. 18500 size means a cylindical cell with 18mm diameter and 50mm length - 15mm shorter than the well-known 18650 size. The battery was bought from  Queen Battery  which is my reliable supplier of genuine cells and tested with  ZKETECH EBC-A20  and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals I've followed all the prescriptions of the  IEC61960-2003  standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hr pause. The environment temperature was 25±2°C. To be sure in results i've done each test  minimum twice  (usually 3-7

Sony VTC5 or US18650VTC5 is a 2600mAh 18650-size Li-ion cell which supports continuous discharge at up to 30A with 80°C temperature cut or up to 20A with no temperature control. VTC5 can hold up to 100A pulse discharge for <3 seconds. The battery was bought from Queen Battery which is my reliable supplier of genuine cells and tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A. I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle the battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hr pause. The environment temperature was 25±2°C. To be sure in results i've done each test m