Hi , i had EP4200 in my HB cyclone and they fited fine , the 4200 i had where marvelous punchy and great cells , so the 4600 i think will be really good , but i have movd to ENERG cells .
The EP4600 are in diameter :22,80 mm
and in lenght or hight :42,70 mm
They are also 71,5 g in weight . hope it helps