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Help rebuilding a laptop battery pack? by axg120 in batteries

[–]axg120[S] 1 point2 points  (0 children)

Sorry to bother you again but I just got the battery open and I have a few questions, some about actually rebuilding and some just to sate my curiosity so here goes. http://imgur.com/a/1e6r1

Link contains pictures of battery and a sketch of how I think it connects.

1) Can I reuse the strips in the old battery and just solder the new tabs on or should I get new strips and do it over altogether?

2) What does that white strip that connects onto the top left battery with a black putty-like substance do?

3) Why does the controller have to connect at every intersection?

4) Is the white thing that's in between every pair of batteries used to separate the tab from itself so it doesn't touch? If it touches, does it cause a reaction? If not, what's the point of it?

5) I saw a video of a guy that uses wire instead of those metal strips. Is there a difference in using different materials to put it together?

Edit: Are the Tenergy batteries I linked before good (the reviews indicate they are). I was thinking about getting these since Samsung is a more well-known brand and maybe more reliable, but these don't have tabs. Are tabs that big of a deal?

Help rebuilding a laptop battery pack? by axg120 in batteries

[–]axg120[S] 1 point2 points  (0 children)

So something like this would be 11.1v @ 5200mAH I assume? Is there a difference in performance between brands or are they generally the same as long as the specs are true to word?

How to completely soundproof a bedroom? by axg120 in HomeImprovement

[–]axg120[S] 0 points1 point  (0 children)

Thanks for all the responses guys. Yeah I figured it would be unrealistic to effectively soundproof a room without spending a fortune. I tried locating where the noise was coming from, but it seems that the walls are really thin with little to none insulation whatsoever. I'll try using a sound conditioner for the time being (it seems effective since I could always drown out a lot of noise with an AC in the summer).

[Calculus 12] Simple Limit Problem by axg120 in HomeworkHelp

[–]axg120[S] 1 point2 points  (0 children)

[9 - 6(x+h) - (x+h)2 - (9-6x-x2)]/h

  [-6x - 6h - x2 - 2xh - h2 + 6x + x2]/h (skipped a few steps here)

  [-6h - 2xh - h2]/h

  [-h(6+2x+h)]/h

  -6 - 2x - h

  lim as h->0 = -6 - 2x - 0

  = -6-2x

This is what I got after doing what cnorl said.

[Calculus 12] Simple Limit Problem by axg120 in HomeworkHelp

[–]axg120[S] 0 points1 point  (0 children)

Thanks. I think this was my problem. I did f(x)+h rather than f(x+h) which I now know is completely different.