This time a short(ish) post with some technical data about replacement batteries for power tools from AliExpress. After years of being reluctant to try any after-market batteries for my Dewalt tools, mainly due to quality/safety concerns, I final gave these a try. I opted for a slim (single stack of 21700 cells) 4Ah battery from TPCeLL (TP-cell). The capacity is what I typically use (3-5Ah normally), the form factor is quite compact, and the price was too low to resist. So is it any good? Lets have a look.
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