We remember the Sonicare Xtreme, and like you suggest, since it used off-the-shelf AA batteries a fresh charge was always possible, no matter where your were.

We assume you've read what we state about the PowerUp above (it's a 15,000 brush not a 31,000 one) and how we don't think it makes an acceptable choice.

The rechargeable Sonicares that would be better at sustaining a charge are the lithium ion battery models. We show "operating time" estimates above.

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