In our opinon these are better than the guenine Swellpro Battery
LiPo Battery Specifications: Type: High Voltage Li-Polymer Battery Brand: LEOPARD-POWER Model No.: 8000mah/15.2V/35C Minimum Capacity: 8000mAh Configuration: 4S / 15.2V / 4 Cells Continuous Discharge Current: 35C(280A) Burst Discharge Current (10 sec): 70C(560A) Charge Rate: 1-2C(max.5C) Pack Internal Resistance: 7Ω Pack Voltage for shipment: 15.34V Pack Size: L 136 x W 43 x H 45.5mm Pack Weight: 586g 1. Automatic stacking technology and Nano Tech enables single-cell minimum capacities of 8000mAh, higher C rate, high energy density, stable performance. 2. Extreme low internal resistance guarantee by advanced ultrasonic welding technology, pack Internal Resistance at 7Ω. 3. Matching cells for a battery pack by computer, ensure that 5mV maximum for voltage difference and 50mAh maximum for cell capacity difference. 4. Each cell has its individual QR-Code as identity, it is recording all information by our OCV System.