New Firmware -- Overtemp warning

HI Blanca,

Thanks for following up.  At the time, I believe Ethernet standby was "disabled."  When Ethernet is on (aka not disabled) the idle train on the battery is definately increased which could elevate the unit and battery temperatures.  But since then I've changed it to 2min as I am not using Ethernet right now (but I do from time to time)

Here are my unit's details:

MR1100-1A1NAS, H/W 1.0, SKU 6112B
Purchased March 2018

FW: NTG9X50C_12.05.05.00
FW Date: 2018/07/25, AT&T Wi-Fi
PRI: 03.12
Web: MR1100-1A1NAS_04.01.70.02

Current Temp: 26 degrees C (78.8F)*
Battery Temp: 26 degrees C (78.8F)*

*Unit was turned off overnight sitting inside my house whose
ambient temperature is 71F (21.67C)

Currently, at this temperature, the mr1100 will accept a charge. I didn't check the temp
when it was refusing a charge a couple days ago, but from fealing it in my hand it was definately warmer at that time -- perhaps approximately body temperature.

Compared to ambient, the temperature sensors definately have at least a 3 to 4 degrees C positive bias (aka calibration error).

https://en.wikipedia.org/wiki/Lithium-ion_battery

It's generally accepted that Lithium Ion batteries have a working and charging range of at least 5C to 45C.

Though some reputable sources claim that up to 60C is fine

https://ehs.mit.edu/site/sites/default/files/documents/Lithium%20Battery%20Safety%20Guidance.pdf

For example, my iPhone which sits in my pocket which is ~35C all day readilly accepts a charge under heavy use on at hot summers day when the device it at least 50C.

In order for the MR1100 to be practical, it must be able to accept a charge while simultaneously under normal to heavy data use (wifi, ethernet USB) under ambient conditions that are at least 75-85F.

Next time I get the message that the unit is unable to charge, I'll try to get the temperatures for you.

Thank you,

Jonathan