This cell is a 20650. It is 20mm in diameter and 65mm long. It does not have the usual LG four “leg” top contact. This cell only has three “legs”.
I can’t find the datasheet for the HG6 but postings I’ve seen so far show it as a 30A cell with a minimum capacity rating of 2900mAh and nominal capacity rating of 3000mAh.
In my testing it easily outperforms the excellent Sony VTC5A and runs cooler than the LG HB6. It is a great performing true 30A cell.
Against the other 20mm diameter cells it also does well. Down to 3.2V the HG6 equals or beats by a little the Sanyo NCR20650A or iJoy 5-leg 20700. The Sanyo NCR20700A still beats all of them, but not by a lot.
While rated at 3000mAh, cells I tested from two sources and having two different batch/date codes only delivered about 2800mAh of capacity at 0.5A down to 2.5V. This is 100mAh lower than its minimum capacity rating. LG uses a cutoff voltage of 2.0V though for their capacity rating for this cell. If I ran them down to that level I think they would meet the 2900mAh minimum rating.
To allow for direct comparisons of any cells I test I set my capacity testing cutoff voltage at 2.5V. Since two HG6’s, from two different batches, tested near 2800mAh when discharged at 0.5A down to 2.5V I am rating this cell at 30A and 2800mAh. It still tests out well, as described above.
Two cells were donated by EcoLux (https://ecoluxshopdirect.co.uk) for the purposes of testing. Thank you! Two other cells were purchased by me.
Cell photos: https://imgur.com/a/XuyYq
Ratings graphic: https://imgur.com/a/btfnH
Test results, discharge graph, photos: https://www.e-cigarette-forum.com/forum/threads/bench-test-results-lg-hg6-30a-3000mah-20650-a-great-true-30a-battery-but-only-2800mah.834503/
All my test results to date: https://www.e-cigarette-forum.com/forum/blog-entry/list-of-battery-tests.7436/