To avoid leakage or Black Wire Corrosion, always remove battery from any ttransmitter , switch harness, torchlights etc you name it.

. Aurora 9 - Transmitter - Care of, especially in high humidity areas.
extract
"Extract from another response to query in A9 thread re battery (any TX) removal after use/storage
"Hard to define as much also depends upon climatic conditions and how and where a TX is used and then stored.
If Tx is used and stored in a very dry area, then not to much of a problem but if used and then left in a case which has been open during humid conditions, especially at a cloudy slope soaring site or spray covered ocean cliff, then it will be more susceptible to black wire and other corrosion, or simply left in the garage/shed, even some houses may have high humidity levels inside.
(All known quality electronics stored in warehouses/retail shops contain little bags of dessicant for a good reason.)
Corrosion caused by old or damp batteries is the leading reason, by a very big margin, of all brands/types of transmitters being brought in for service.
With many different TX in my "playroom", batteries are always removed at end of day except for those I know I will definitely, as opposed to "think I will" use within the next month.""

Also with regard to Lipo, please refer:
. Aurora 9 - Lipo User Adjustable Voltage sets Shut Down = <font color="Red">TURNS TX OFF </font>to save damage to Lipo Battery and/or TX
<font size="1"> (Audible Battery Warning is still at 6.9V with Lipo which provides say 10-20 min before shutdown.)
</font><span style="font-size: small;">. </span><font size="1"><span style="font-size: small;">Aurora 9 - Warning Alarms</span><span style="font-size: small;"> Battery types, Voltage Level Interpretation &amp; Consumption. </span>
<font color="Red">CAUTION - Leave Auto Hibernation <font size="1">(was Auto Power Off prior to V1.06)</font> as "Never" when using Lipo Battery.
<font size="1">During "Auto Hibernation" (as with laptops), TX Does Not Switch everything Off</font></font><font size="1"> and batteries will be completely drained if TX switch is not
manually moved to the off position in good time. Remove battery and store separately if TX is to be unused for a period.</font>
. </font>Aurora 9 - Lipo &amp; Field Fast Charging.<font size="1"> includes Fast Charge Aurora, Eclipse 7 &amp; 7 Pro, Flash 4 &amp; 5, Laser, Optic 6, Optic 5, Lite 4, Prism 7 etc.
</font>
ex Hitec USA Support Forum Sticky:
Aurora 9, AFHSS 2.4Ghz Module, Transceivers_Receivers &amp; Telemetry
- FAQ, Setups &amp; Tips {Individual Links often updated}

Alan T.
Alan's Hobby, Model &amp; RC FAQ Web Links