Aliexpress Dumpster Batteries.
Sept 28, 2022 23:22:09 GMT
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ratcheeroo and Mr NCT like this
Post by Burkeomatic on Sept 28, 2022 23:22:09 GMT
I ordered some 4s2p batteries from aliexpress, rated at 9000mah, 4500mah per cell.
I fully expected them not to live up to their rating, so I didn't trust them out of the gate, so I had to test them.
I sent my reptile dragon up with it. I took it out pretty far at first, but then I realized that voltage was dropping quicker than I had anticipated, so I brought it back close. I noticed my OSD said I had used about 2500mah, I don't exactly trust the osd 100 percent, but I was under 14.7 volts. I had planned to fly them until I hit low voltage cut since I knew you could do that with these batteries anyways, but they just went down way, way faster than I thought they should have.
So I just decided to do pretty wide racetrack laps until it drained all the way, then when I was at about 2800mah voltage started dropping like a rock, and I was barely able to get it on a decent glideslope to get it back, brought it in dead stick, but I had plenty of altitude in anticipation.
Honestly, I didn't expect these to be 9000mah, and I thought that was pretty unrealistic. But I bought them just to see. I figured they would at least maybe be the 3000mah cells or 6000mah total, and I could make peace with that, maybe be a little salty about it, in fairness I kind of knew it was coming, but move on with my life.
I didn't even know they made 1500mah cells. So at first I chalked it up to a cell being bad, but then when it happened to the second battery, I knew something was up. So I just had to open them up, and this is what the 4500mah cells looked like.
Damn, if you are going to counterfeit something, at least do a little better than that. I still somewhat have a use for these batteries, but not much of one. They just so happen to fit the dolphin perfectly, and I can't fit a 4s4000mah in it, so it gives me more capacity than other options. These are a fail on the aliexpress crapshoot. Sometimes you win with them, sometimes you lose, and this was a loss. Luckily I paid with paypal, documented everything, so I should easily be able to reclaim my money and get some ''real'' batteries.
I fully expected them not to live up to their rating, so I didn't trust them out of the gate, so I had to test them.
I sent my reptile dragon up with it. I took it out pretty far at first, but then I realized that voltage was dropping quicker than I had anticipated, so I brought it back close. I noticed my OSD said I had used about 2500mah, I don't exactly trust the osd 100 percent, but I was under 14.7 volts. I had planned to fly them until I hit low voltage cut since I knew you could do that with these batteries anyways, but they just went down way, way faster than I thought they should have.
So I just decided to do pretty wide racetrack laps until it drained all the way, then when I was at about 2800mah voltage started dropping like a rock, and I was barely able to get it on a decent glideslope to get it back, brought it in dead stick, but I had plenty of altitude in anticipation.
Honestly, I didn't expect these to be 9000mah, and I thought that was pretty unrealistic. But I bought them just to see. I figured they would at least maybe be the 3000mah cells or 6000mah total, and I could make peace with that, maybe be a little salty about it, in fairness I kind of knew it was coming, but move on with my life.
I didn't even know they made 1500mah cells. So at first I chalked it up to a cell being bad, but then when it happened to the second battery, I knew something was up. So I just had to open them up, and this is what the 4500mah cells looked like.
Damn, if you are going to counterfeit something, at least do a little better than that. I still somewhat have a use for these batteries, but not much of one. They just so happen to fit the dolphin perfectly, and I can't fit a 4s4000mah in it, so it gives me more capacity than other options. These are a fail on the aliexpress crapshoot. Sometimes you win with them, sometimes you lose, and this was a loss. Luckily I paid with paypal, documented everything, so I should easily be able to reclaim my money and get some ''real'' batteries.
