These batteries performed noticeably better than the other 300mAh and 350 mAh batteries from competitors. If you're leisurely flying, the cheaper batteries will work, but if you want to have more power throughout the charge of the battery, these are better. On the downside, they cost more than the competition. Also, note that I soldered xt30 connectors because that was the connector on the drone we were using. So, I can't comment on the performance on the GNB27 connection

Some hefty batteries.. square cells stable internal resistance, maximum punch on these for tiny 2s! Got 6 to boost my 2s using the new NBD BeeBrain AIO ELRS, buy these rn !

Good

Definitely buying more of these.

I wish there was a simplified 2s charger.

Good lightweight HV lipos for small crafts. I’ve even slapped these on a 65mm whoop with my 0804 12,000kvs just for funsies and it was interesting to say the least.

Of course I have to solder up my own XT30 to GNB 27 connector so I could plug into my charger but is wasn’t too big of a deal. Otherwise you could do like some others and chop it an ad an XT30. I like GNB 27 as well though so I’m keeping it as is for now.

They have 2s chargers out there that only charge through the balance cable so if you absolutely can’t solder that can be an option, but the one I saw only charged each cell to normal 4.2V and not these HV at 4.35V. You can still use it but wouldn’t be making full use of the HV lipo capabilities.