This makes for five different types of HG2 fakes and there will be more so be alert. My thanks to ECR’s /u/tarek26007 for posting pictures of his.
Luckily this version is easy to spot. It has a five “leg” top contact and not four like the genuine HG2 does. It also has an invalid date code, “O2O3”.
You can check the date code for a lot of batteries using the BatteryBro tool:
https://batterybro.com/pages/18650-date-code-lookup-tool
A valid date code does NOT mean it’s a genuine battery. They could have easily used a genuine code on their fakes.
Images of the fakes and a real HG2: https://imgur.com/a/Bq8Sk