Performance is very close to this ultrafire: http://lygte-info.dk/review/batteries2012/UltraFire%20SZ18650%209900mAh%20(Yellow)%20UK.html
That i did open: Disassembly of UltraFire 9900mAh 18650 battery
But this cell is a few grams lighter.
Performance is very close to this ultrafire: http://lygte-info.dk/review/batteries2012/UltraFire%20SZ18650%209900mAh%20(Yellow)%20UK.html
That i did open: Disassembly of UltraFire 9900mAh 18650 battery
But this cell is a few grams lighter.