Knock off batteries for cordless drill auger?

Does anyone regularly use any of the off-brand amazon batteries for running their auger/drill combos? I have a dewalt dcd999 hammer drill that I have been using paired with an eskimo pistol bit 8″ auger. I have dewalt 4ah and 6ah 20v max batteries. I had an old 20v 5ah knock off that quit working this year. I had got 3 seasons out of that so I decided to try a 9ah knock off. I ordered that less than 2 months ago and my last outing in 40 degrees it drilled 4 holes and then just wouldn’t want to power the drill. I will say it was more likely closer to a 6ah battery based on size and weight compared to my dewalt one.

But my 6ah dewalt 20v max battery is still trucking just fine – it was comparable to the new one to start the season. I always bring my batteries inside to charge, and let them get to room temp before I ever place them on a charger. Is it something with how i handled it? The battery has never been dropped and I only walk out with a sled to anywhere I fish. I keep them in a soft sided cooler wrapped in rags to cusion/keep them warm when i have extras in the sled. I also never set the drill/battery in the snow and keep them on an auger rack on my sled. Any ideas or input would be greatly appreciated!

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I run Milwaukee tools, but I have several of the Amazon Chinese batteries for them.
I haven’t had the discrepancy that you had, but they do not last as long per charge or have the same usable life span as an equivalent Milwaukee battery. And they don’t seem to do as well in the cold. My Milwaukee HO 8.0 ah battery will drill nearly 20 more holes per charge than my 9.0 ah Chinese battery. But the Milwaukee was $150 on sale, and the Chinese was $65.
I run an angle grinder a lot, and for those projects, having several of the Chinese batteries is cost effective. But I will be getting a 12.0 ah Milwaukee if I ever see a decent sale price on them.

If you have the opportunity to return it, I would. If not, I would write a critical review of the battery, and hope the seller will try to make it right – they are aware that critical reviews cut into their sales.

You get what you pay for.

They are crap. I bought 4 of those to use with my dewalt tools and they all puked.

I’m very dewalt heavy in tools so its hard to do a complete swap to Milwaukee. By far out of all the tools my subs use, Milwaukee has the best longevity that I have seen. Others may have differing opinions

While the price may be tempting, many of those chinese knock-offs are c-rap! A disproportionate percentage of fires caused by defective Li-Ion batteries were caused by knock offs. I once bought one for the 18v hitatachi that powered my nils 8″. I couldn’t get beyond 10″ deep before the thermo relay in the battery started cutting out. It may be a nice feature safety wise, but causes nothing but trouble in high amp draw processes. Nobody out there is cheaper than me, but take my advice. Go OEM.

I appreciate the responses. I definitely went in thinking there was a good chance it wasn’t going to make it but figured for the price I should try. I made this decision after a trip where i thought I had brought plenty of ah and got stuck unable to drill more holes – likely due to it being -10 to -20 out when i had only used them in warmer weather.

The only good piece to come out of this is that these batteries will still power a regular drill or other lower amp draw items. Maybe i’ll get lucky and they will honor a return – if not it will be my dedicated weed whacker and sawzall battery for the future.