Nook Simple Touch wall charger for Kobo Aura HD?

[Taike]

Just received my Kobo Aura HD! Can I use the Nook Simple Touch wall charger for the Aura HD?

Cheers

Taike

[John F]

I'd say yes. I have a USB wallwart that says Nook on it (it was from a Simple Touch), and it has a USB cable with a Logitech label on it. I've used it to charge an Aura HD (and Glo and Touch).

[Taike]

Thanks for the swift reply, John. That's good to know.

Taike

[FJames]

Any USB charger with a micro-usb cable will work to charge the Aura HD. The Aura HD will attempt to draw up to 800ma from the charger, but it will fall back to 500ma if it can't get 800. The charging time will be longer with a lower current, but it won't hurt anything.

[Ken Maltby]

Originally Posted by FJames

Any USB charger with a micro-usb cable will work to charge the Aura HD. The Aura HD will attempt to draw up to 800ma from the charger, but it will fall back to 500ma if it can't get 800. The charging time will be longer with a lower current, but it won't hurt anything.

It should also mean that your battery lasts longer, if charged at the lower rate. I charge my AuraHD using a 500ma USB charger and it isn't that much slower to charge. I haven't actually timed it and do not sit and watch it charge so if there is a difference, I haven't noticed.

Luck;
Ken

[RobertJSawyer]

Originally Posted by Ken Maltby

It should also mean that your battery lasts longer, if charged at the lower rate.

Really? I don't doubt you, Ken, but why is that true? And by lasting longer, do you mean it will last for more charge-discharge cycles, or that it will give longer life on each cycle? Thanks!

[davidfor]

Originally Posted by RobertJSawyer

Really? I don't doubt you, Ken, but why is that true? And by lasting longer, do you mean it will last for more charge-discharge cycles, or that it will give longer life on each cycle? Thanks!

If Ken means "longer before it has to be replaced", then yes. But it probably isn't noticeable at the rates were talking about. And it is possible the ereader has limits the charging current to a maximum no matter what the available input.

[Ken Maltby]

Originally Posted by davidfor

If Ken means "longer before it has to be replaced", then yes. But it probably isn't noticeable at the rates were talking about. And it is possible the ereader has limits the charging current to a maximum no matter what the available input.

Right, "longer before it has to be replaced". The difference in the battery's useful life, from charging at 500mw vs. 800mw would be significant, but what the actual numbers would be, I have no idea. As it is these batteries seem to last a long time, and I suspect that the amount of use has a similar effect on the battery's longevity, heavy use having an effect much like higher current more rapid charging.

The "why it is", relates to the effect of heat on the electro chemical process, the current used to charge most batteries creates some internal heating, by necessity, and the more current the more heat. While more current can speed up the charging process it also does more damage to the cell, and speeds its inevitable demise. Less current and more time will achieve the same level of charge, with less damage to the cell.

Luck;
Ken

[RobertJSawyer]

Thank you, Ken! Fascinating!