Belkin is back with a brand-new battery pack, one the mobile accessory maker claims is its most compact and fast-charging yet. Part of its Pocket Power series, the new pack will be available to purchase in three power tiers: 5,000mAh, 10,000mAh and 15,000mAh. Competitors like the Anker PowerCore provide 20,000+mAh to play with, but Belkin's latest...