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590		-== 2.5  ​Battery Analysis ==
	590	+== 2.6  ​LED Indicator ==
591	591
592		-=== 2.5.1  ​Battery Type ===
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	593	+The NDDS75 has an internal LED which is to show the status of different state.
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	595	+
	596	+* When power on, NDDS75 will detect if sensor probe is connected, if probe detected, LED will blink four times. (no blinks in this step is no probe)
	597	+* Then the LED will be on for 1 second means device is boot normally.
	598	+* After NDDS75 join NB-IoT network. The LED will be ON for 3 seconds.
	599	+* For each uplink probe, LED will be on for 500ms.
	600	+
595	595	(((
	602	+
	603	+)))
	604	+
	605	+
	606	+
	607	+== 2.7  ​Firmware Change Log ==
	608	+
	609	+
	610	+(((
	611	+Download URL & Firmware Change log
	612	+)))
	613	+
	614	+(((
	615	+[[https:~~/~~/www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/Firmware/>>url:https://www.dragino.com/downloads/index.php?dir=NB-IoT/NDDS75/Firmware/]]
	616	+)))
	617	+
	618	+
	619	+(((
	620	+Upgrade Instruction: [[Upgrade_Firmware>>||anchor="H5.1200BHowtoUpgradeFirmware"]]
	621	+)))
	622	+
	623	+
	624	+
	625	+== 2.8  ​Battery Analysis ==
	626	+
	627	+=== 2.8.1  ​Battery Type ===
	628	+
	629	+
	630	+(((
596	596	The NDDS75 battery is a combination of an 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is none-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter.
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