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  1. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'll look around before buying then. Thanks for the tips. :)
  2. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    CocaCola, do you think this would suffice? Click here. It's a bit pricy for my liking, but I found a few that are WAY cheaper...at the cost of a lower capacity. :/ What capacity do you think would fit 3A best?
  3. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'd rather go with a smaller lipo battery then a car battery sized battery labeled as "lead acid". :p I'll look into the lipo batteries then.
  4. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    My fear is that this it just a prototype. I don't want to buy a lipo battery and end up discharging it too fast or charging it at the wrong voltage. There are so many windows of error with lipo batteries.
  5. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'd really rather not go with lipo. I've seen what those things can do if used wrong.
  6. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I just realized that in order to continue, I really need a voltmeter. I can probably get one monday.
  7. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Oh, I see now. And I agree with gorgon. That battery isn't by any means pocket sized :p After the D cells didn't put out enough power, I'm trying to get a custom ni-cd battery that has 12 cells. 2 groups of 6 cells that are wired in parellel to double the battery life. Assuming that each cell...
  8. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    By "12V 7Ah SLA" do you mean something like this? Click here. And what do you mean by "small DC-DC switch mode converter"? Please explain it like you're explaining it to a 10 yr old. :p
  9. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I have no specific need for this other then a challenge and learning the next step in electronics (I've already learned a lot thanks to you all :D). I'd like it to run for 4 hours. And yes, I want it to be portable. I'd rather not make a cigarette lighter version of it's ac adapter, because that...
  10. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'd like it to run for...quite a while. If you need an exact time, lets say 4 hours.
  11. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'm sorry. I currently have no way to test that. I'm fairly new to this level of electronics, and I don't have a voltmeter. If it helps, I'm using 5 "Enercell" brand D batteries wired in series.
  12. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Update: I ended up trying the D batteries, but the power isnt enough. It's as if the screen is out of sync. The screen is really really shakey. Once it tries to read from the disk, it draws too much power and resets. :( Any other ideas? I'd really rather not get a lipo battery. Maybe a nicd...
  13. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Yeah. The battery life of the D batteries at 3A probably wont be enough.
  14. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Actually, that helps quite a lot. I think if I run into problems with battery life, I'll try those ideas.
  15. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I'm using 3A over 5 batteries. Will that raise the battery life?
  16. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Update: I just went to radioshack and got some D holders, wired them all together, then found out that I bought the wrong connecter :p I'll have to wait till tomarrow to get what I need because radioshack is closed now. I was impressed by the power that 5 D batteries put out. I...
  17. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    Good idea, but I'm trying a more low-cost method first. If it fails, not a lot of money is lost.
  18. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I settled on using D's. Are those powerful enough?
  19. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    I think 5 would. 6 would probably be too much voltage. I think I have a charger somewhere, but it's probably only for AA and AAA batteries. Good idea. :) EDIT: I just did the math and 6 is too much voltage. My project calls for 7.5V and that gives off 9V.
  20. D

    I want to make a battery pack that can make 7.5V at 3.0A.

    That doesn't sound too good. :p If I were to use D cells, I would use 5 of them (1.5V * 5 = 7.5V). If I do this, is that in danger of blowing up? On an unrelated note, what you said reminded me of my "hand warmers" I used to make. They were just two 9Vs hooked up to each other. I was so...
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