There’s nothing useful on them, and searching for the sequences on them online returns nothing remotely resembling a battery. Still no clue.Įven after removing the shrink wrap, I still don’t know what the cells are. With no clue as to what these cells are in the pack, I keep going and separate them from the case and interface board. At some point, I might buzz out the boards and see what exactly they have going on, but not today. I saw a tiny transistor on the front side, but wasn’t able to get a good shot of it. The backside of the connector board is just a few passive components. Talk about a boring job… wait, I build batteries! Also, the soldering is clearly hand done, so it’s probably hand built. I’ll wager hand done, though, because it’s a 2010 pack, and I’ve not seen any machine assembled ones of that age. I normally try to guess if a pack is hand spot welded or machine assembled, but this one is too gross to do much analysis on. I just don’t know what happened here, exactly. Given how much dirtier one of the cell housings is, it’s possible that a cell vented, but the pack was filthy on the outside, and it still could be a lot of water damage. Like most of the DeWalt packs, the cells just pull out (with a tiny bit of prying if they’ve been corroded in place), leaving the bottom of the case. I tried to probe the pins and sort out what’s going on with the six center pins, but with a dead battery pack, that’s tricky, and I’ll get to it later. You’ll be a hair above 12V fully charged (around 12.3-12.6V depending on where the charger quits), have useful power down to 9V, and below that, you’re just abusing the battery for no actual energy extraction. I’d recommend running this pack no lower than 9V. If you were to “stick a conductive object” in the end pins, you’d find pack voltage, and it’s up to you to monitor the pack voltage and keep it from deeply discharging. Like the 20V Max packs, the end terminals are double height (which makes sense, as they’re the main current carrying terminals), and they’re always live. You can see the interconnect leading straight to the end terminal on this side. They won’t run very long afterwards, and then someone like me will make snarky comments about you in a decade. But, seriously, don’t leave your tool packs out in the rain. Given what looks (and feels) like an old pine needle in the top left, I’m going to guess this pack got quite wet from being left outside a long while. It’s quite corroded, either from a vented cell or from being quite wet. I’ve seen some nasty packs, but this is up there. Almost exactly 8 years ago to this post, which long predates this blog’s existence.Ī couple T10 Torx head screws laster, and I’m in. Probably week 34, if it’s a normal build date encoding, so late August. Also of note, on the right side, you can see a 2010 build date under the muck. It’s lost in the reflection here, but someone did write “Bad” in faded marker on the latch. Unless DeWalt has done something very, very weird with this pack, it’s quite stone dead. I did a bit of probing around with the pack assembled and couldn’t make any sense of what I saw, though. Annoyingly, these aren’t labeled like they are on the newer packs. This pack has the same general connection layout as the bigger lithium packs - two double height pins on the end, and six sockets in the middle. I mean, they’re not even security bits!īefore I dive in, let’s inspect the top. The bottom of the pack has the usual warnings about reading the instruction manual, which probably would say things like, “Do not disassemble this pack.” Not having an instruction manual, obviously, I don’t know any better than to just whip out my Torx T-10 drivers and go right in. I will never manage to get myself hired as a tool battery marketing type. Now, if I were to call this pack something, I’d call it something like 11.1V, 14.4Wh, but that’s me. If you divide 15.6 by 12, you get a neat and tidy 1.3 - so I’d guess the cells in here are 1300mAh cells, and three of them. I’ve messed with enough DeWalt packs to know that their capacity ratings are determined by someone in marketing with a calculator and not any of the engineers. But, they are tool batteries, and I do like tearing tool batteries down - so, join me! The DeWalt 12V Lithium Ion DCB120ĭeWalt DCB120 Battery Pack (about $25 on eBay for a genuine one) is a “Type 1” battery pack (the 20V Max packs are Type 2), rated for 12V (Max), and 15.6Wh. I like my “100Wh” DeWalt 20V Max/6Ah battery a lot, and these are about 15Wh. This week, I’ve got a pair of cute little 12V lithium batteries to pull apart - one DeWalt, and one Ryobi.īy my standards, both of these are really, really cute. It’s been over a year since I’ve posted any tool battery teardowns, and it shouldn’t surprise anyone terribly much that I’m the sort of person who collects tool batteries wherever I roam.
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