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Watch out for fire hazard…
TTGO LoRa32 V2.1-1.6 purchased on eBay
New message from: seatechnolgy_4 Sep-10-18 19:03
“Since V2.1-1.5 was upgraded to V2.1-1.6 version, due to negligence during the modification, the problem of charging circuit was not found. Today we found it after testing.”
New message from: seatechnolgy_4
Diode components should be used on the charging circuit. We used a fuse. The diode is energized in one direction, but the fuse is bidirectional, which cause the USB voltage directly accessing to the battery. After a long time charged, the battery is hot or burned, so please you mustn’t use this V2.1-1.6 version to charge the battery! ! ! (Note: The board can be powered by battery, but we mustn’t charge the battery when the battery is connected to the board, mustn’t charge! mustn’t charge! mustn’t charge!)
If you want to use this V2.1-1.6 version to charge the battery, you need to replace the fuse in the picture with a diode(BS5819 SOD123 with 1A current), then the charging function return to be normal.
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RAK831
This is the Bargain basement right? 
For a more normally (lower) priced RAK831 (still not a true bargain though) check here:
Which was mentioned here: The BARGAIN basement part 3
RAK 831 total Price: € 122,76 yes that’s cheaper 
I suggest check prices daily… especially on Ali Express, they fluctuate a lot
No I don’t. I checked your Bangood link and was surprised by the price.
Then checked my old link again. Although the price fluctuates it appears to usually have the lowest price.
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