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Most probably because there are similarly named competitors (e.g. Anchor http://www.anchor-world.com/)

My guess is that they don't want a failed HA product line associated with the Anker brand.

Agreed - they've gained a bunch of brand capital, wonder why they're starting fresh.

My guess is they feel the brand capital is too invested in "battery chargers" and believe it will be easier to rerun their playbook for building cachet with the new brand rather than risk their current single category focused brand.