> To: lml@lancaironline.net
> Date: Sun, 29 Jun 2014 15:42:09 -0400
> From: tom@lachollatech.com
> Subject: [LML] Re: IPAD Solution
>
> I am another Ipad in-flight user and am very happy with it. As others
> have said, keep it out of DIRECT sunlight. With the WIFI turned on
> (required for my ADS-B receiver) it does drain the battery faster.
>
> I researched the literature quite a lot about re-charging and there was
> a lot of grumbling from non-aviation users of IPad 3 (and newer) when
> they first came out. Those people complained that the IPad would no
> longer charge from a wall charger while being used heavily, and it would
> never re-charge if plugged into a computer's USB port. The complainers
> were correct. BTW a computer's USB port is limited to .5 amp by the
> USB standard. The response from Apple was that the newer models use
> significantly more power than prior versions. So much more that the
> Apple standard 10 Watt (~2.1 amps at ~5 volts) wall chargers deliver
> about the same power back to the unit for re-charge as it is consuming
> when WIFI is on and the screen is bright etc, etc. Apple technical
> people said that a unit with a low state of charge will not re-charge
> while in heavy use from a wall charger or auto charger. In order to
> recharge, the heavy consumption of power must be removed until re-charge
> is complete. Just closing the lid does that, or the short push of the
> power button.
>
> So, the upshot for us is, IPad 3 and newer won't really re-charge at all
> in-flight, but consumption of the battery should be greatly reduced if
> we use the right charger.
>
> All in all, I can fly two four hour legs and the battery is not
> excessively drained, if I plug it into the cigarette lighter with a
> quality 10 Watt auto charger. These are 2.1 amp at 5 Volt output. There
> are dual chargers out there advertising 15 Watts but most are one outlet
> at 2.1 amps and one at 1.1 amps. The lower output connection is
> appropriate for phones or other small devices. The IPad 3 itself won't
> consume more than 2.1 amps anyway, so more would not help.
>
>
>
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