FancyWhoop 2pcs 450mAh 2S 7.4V LiPo Battery Pack 80C with XT30 Plug for Micro FPV Racing Drone Quadcopter

Unfortunately of the two batteries I received (450mAh 2S 80C XT30) on one of them a cell has unacceptably high internal resistance (showing 78 mΩ in the image, yesterday reported 90 mΩ), and that same battery will not balance or charge properly. The second battery also has quite high internal resistance on it's cells (40mΩ) Ordinarily I would return the product, however because it is a LiPo sending through the post isn't really an option, and for some reason (perhaps the same one) the usual easy Amazon return options are not available.I'm leaving the review to highlight the challenge of returning LiPos when they may arrive faulty and as a plea to the seller to rectify the problem - as it is I am stuck with a useless battery!

Quite good for the price.I also bought the multi port parallel charger from the same seller to use with charging these batteries.I charged one at a time at first, and no problems to report - internal resistance was acceptable (smaller mah packs tend to have a high IR, or so my whooping friends tell me).They fitted perfectly into the Mobula7 HD frame - was a nice tight fit so the battery didn't come loose.Perhaps a little too heavy for the mob7hd though - although it did work in my favour by keeping it a bit more stable.Happy purchase! I'd recommend that charger too, makes charging the batteries a little bit quicker by doing a few at once!

I have bought 2 lots of these lipos and in both lots there was a bad lipo. Both of these batteries had a single bad cell that wouldn't hold voltage and drained very quickly, leaving a voltage difference of around 0.4 volts. I thought the first failed battery was a one off, so I bought another lot, only to have one of those fail, very disappointing.[Edit] - The seller has now refunded one of my purchases, which makes up for the 2 faulty batteries. I hope they manage to sort whatever problems they were having, as the 2 remaining good batteries are performing well for the price.

Just received the batteries and one battery cell 1 - 120.5 mΩ cell 2 = 49,6 mΩ, second battery cell 1 - 70.9 mΩ cell 2 45 mΩ massive difference in mΩ And the values a too high.

Bought 2 2s batteries only to find each had a faulty cell.I would have returnd them, but I chose to make a good 2s from the usuable components and safley disposed of the faulty cells.check them first .visualy I could pick out the expanded cells

its grrrreat

You can never have too many! And these are a perfect choice to build your collection at a great price!