Shift838 Posted October 26, 2020 Share Posted October 26, 2020 (edited) I had some time this weekend and I had a dead BQ4847 that I wanted to bring back to life with a new battery. These types of chips are completely sealed. Go check out my solution (it works) if you have one and need to replace the battery. Very little effort. With a step-by-step tutorial: HERE Spoiler Edited October 26, 2020 by Shift838 5 Quote Link to comment Share on other sites More sharing options...
+TheBF Posted October 26, 2020 Share Posted October 26, 2020 "Ha Ha he says. The very thing I'm lookin' for." (3:00 in the video) Quote Link to comment Share on other sites More sharing options...
GDMike Posted October 26, 2020 Share Posted October 26, 2020 Good job. I once broke a pin on a chip and had only a sliver of metal showing, soni took out my file and filed away enough material to solder a new pin back on, and threw it in a socket. It was an EA grom come to think of it. Great stuff, especially a clock chip. Quote Link to comment Share on other sites More sharing options...
RickyDean Posted October 26, 2020 Share Posted October 26, 2020 Yea, I've recovered some Dallas chips by removing the cover and the old battery, and installing a coin cell battery there. Quote Link to comment Share on other sites More sharing options...
+FALCOR4 Posted October 26, 2020 Share Posted October 26, 2020 3 hours ago, RickyDean said: Yea, I've recovered some Dallas chips by removing the cover and the old battery, and installing a coin cell battery there. What did you have to do to remove the cover? Quote Link to comment Share on other sites More sharing options...
RickyDean Posted October 26, 2020 Share Posted October 26, 2020 (edited) Grind it down, with a grinder. Something like http://www.mcamafia.de/mcapage0/dsrework.htm Edited October 26, 2020 by RickyDean add content. 2 Quote Link to comment Share on other sites More sharing options...
+TheBF Posted October 27, 2020 Share Posted October 27, 2020 14 hours ago, RickyDean said: Grind it down, with a grinder. Something like http://www.mcamafia.de/mcapage0/dsrework.htm This is cool. Looks like we need to do the step to disconnect the old battery too. I was wondering about that. 2 Quote Link to comment Share on other sites More sharing options...
GDMike Posted October 27, 2020 Share Posted October 27, 2020 Is there no way to stack a new battery and connect to pins? I don't know that chip, but it seems to me that there would possibly be a poss and neg in pins? Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted October 27, 2020 Share Posted October 27, 2020 1 hour ago, TheBF said: This is cool. Looks like we need to do the step to disconnect the old battery too. I was wondering about that. Why? The new battery is in parallel with the old—same voltage. I would think it a problem only if the old battery develops an internal short. Is that likely? ...lee 1 Quote Link to comment Share on other sites More sharing options...
+Lee Stewart Posted October 27, 2020 Share Posted October 27, 2020 25 minutes ago, GDMike said: Is there no way to stack a new battery and connect to pins? I don't know that chip, but it seems to me that there would possibly be a poss and neg in pins? It seems you did not read the tutorial. That is exactly what Chris did. There really is no easy way to get at the pins of the socket. It makes sense to expose the pins higher up on the chip by doing the filing rather than unnecessarily modifying (and, possibly, damaging) the board. ...lee 1 Quote Link to comment Share on other sites More sharing options...
+TheBF Posted October 27, 2020 Share Posted October 27, 2020 5 hours ago, Lee Stewart said: Why? The new battery is in parallel with the old—same voltage. I would think it a problem only if the old battery develops an internal short. Is that likely? ...lee Murphy's law is how I evaluate things like that. Since the old battery is dying or dead it doesn't have a high enough EMF so I suspect it will drain the new one somewhat. And some battery chemistry gets upset when you reverse current through it but that's more your area. 1 Quote Link to comment Share on other sites More sharing options...
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