# App Note Wrongly Classified: External Battery Charging Solut **URL:** \ **Category:** Documentation feedback\ **Created:** [August 8, 2011, 10:53am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183 "2011-08-08T10:53:44Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [August 8, 2011, 10:53am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/1 "2011-08-08T10:53:44Z")
External Battery Charging Solution WM\_DEV\_MOD\_APN\_002 Rev 002 February 18, 2010 This is listed on the Fastrack support page: [sierrawireless.com/Support/D … \_EDGE.aspx](http://www.sierrawireless.com/Support/Downloads/AirLink/Programmable_Modems/AirLink_Fastrack_EDGE.aspx) The ‘Hardware Compatibility’ list has checks for AirLink FXT Series : Fastrack Xtend GPRS; Fastrack Xtend EDGE; Fastrack Xtend HSPA; Fastrack Xtend CDMA. This is wrong, because the user does not have have the necessary access to the embedded module within the Fastrack. ---
**Author:** ![paruthiv](https://avatars.discourse-cdn.com/v4/letter/p/eb8c5e/32.png) [@paruthiv](https://forum.sierrawireless.com/u/paruthiv)\ **Post date:** [August 23, 2011, 7:05am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/2 "2011-08-23T07:05:32Z")
Are you trying to say that the user does not have access to VBATT,GND,ON\OFF pin of the module to connect it with the charger interface ?? ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [August 23, 2011, 8:35am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/3 "2011-08-23T08:35:34Z")
Actually, I think the user probably does now have access to the necessary pins on the XTend (but not the Supreme or earlier) - via its new 10-pin microfit connector, as used by the backup battery accessory. But this is not documented at all in the Fastrack XTend User Guide, and is not adequately documented in the battery accessory documentation to allow a user to apply this. 😒 The Supreme (and earlier) don’t give access to the module’s VBATT at all. ---
**Author:** ![Moderator1](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@Moderator1](https://forum.sierrawireless.com/u/Moderator1)\ **Post date:** [August 30, 2011, 7:00am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/4 "2011-08-30T07:00:14Z")
Hi Awneil A documentation tracker has been created for the same.Will keep you updated on this. Regards Moderator ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [August 30, 2011, 8:10am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/5 "2011-08-30T08:10:08Z")
Which issue(s) are you tracking: - the lack of documentation of the XTend’s charging interface? - the (possible) mis-classification of this app note? - both? - other…?? ---
**Author:** ![Moderator1](https://avatars.discourse-cdn.com/v4/letter/m/9fc348/32.png) [@Moderator1](https://forum.sierrawireless.com/u/Moderator1)\ **Post date:** [August 30, 2011, 10:50am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/6 "2011-08-30T10:50:16Z")
We are tracking the lack of documentation of the XTend’s charging interface. Will update you about the second issue also soon. ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [August 30, 2011, 2:20pm UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/7 "2011-08-30T14:20:09Z")
> [@Moderator](#): > > We are tracking the lack of documentation of the XTend’s charging interface. Excellent! 😃 I think it would also be worth having an application note that specifically discussed & illustrated the design of an external battery backup for an XTend ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [November 5, 2012, 10:06am UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/8 "2012-11-05T10:06:51Z")
> [@Moderator](#): > > We are tracking the lack of documentation of the XTend’s charging interface. Any progress on that ❓ > [@awneil](#): > > I think it would also be worth having an application note that specifically discussed & illustrated the design of an external battery backup for an XTend Or that ❓ ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [May 21, 2013, 1:42pm UTC](https://forum.sierrawireless.com/t/app-note-wrongly-classified-external-battery-charging-solut/5183/9 "2013-05-21T13:42:48Z")
> [@awneil](#): > > > [@Moderator](#): > > > > We are tracking the lack of documentation of the XTend’s charging interface. > > Any progress on that ❓ Aparently not: [Battery charging problem getting +CME ERROR 563 - #7 by awneil](https://forum.sierrawireless.com/t/battery-charging-problem-getting-cme-error-563/6319/7) > [@](#): > > > [@awneil](#): > > > > I think it would also be worth having an application note that specifically discussed & illustrated the design of an external battery backup for an XTend > > Or that ❓ ibid