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Socoder -> Off Topic -> minor electronics?...

Fri, 12 Nov 2010, 14:13
spinal
Just a quick question, I have a battery addon for my ds, I was wondering if anyone with a brain could tell me, to add a third battery to the following...



would this be fine?



as in safe and not blow a fuse or soemthing?

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Fri, 12 Nov 2010, 15:30
Scherererer
If the batteries are all identical you should be able to put them all in parallel without issue. The only thing that you might want to do is make sure they are all balanced.

In truth though, I would say it would probably be better to put both "other battery"'s in parallel without a resistor between them, because that's just going to create a voltage drop. If you're really paranoid about backflow you could put a diode on each one, but that's probably unnecessary.

As long as all batteries are the same technology you should be fine (ie don't mix a NiCad with a LiPo).

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Fri, 12 Nov 2010, 17:37
steve_ancell
Are you just trying to make the power last longer?, if so, you don't need the resistors or fuses. Just group all the negatives together and do the same with the positives, that will combine all the capacities together, as if they are one big battery.

As long as they all have the same voltage rating, the voltage will remain the same as if it was the original battery alone.
Sat, 13 Nov 2010, 01:20
spinal
the ds has a built in charger, does tat make a differnce?

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Sat, 13 Nov 2010, 06:24
Mog
Most chargers go off sensing the voltage through a 'feedback' regulator (Such as an LM317 IC) so as long as the batteries are rated the same, it should be fine - However, will take a lot longer to charge. Also, your schematic is good - Remember: Parallel, not Serial; Otherwise you'll cook your DS with 3x the voltage

Odd question but the batteries, i notice a central rail-- is the battery just a simple 2-rail (+/-) or is there any added ones? this could be a problem, actually.

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Sat, 13 Nov 2010, 07:09
spinal
The official DSi battery has three connectors, it appears that the no-name ones also do, however, this setup was originally part of a store bought battery case in which the middle pin was not connected.
Either way, I have connected all the batteries together inside the case and all seems to be working well, one note though, I connected the third battery in the following way -



I'm expecting it to take three times as long to charge, but I also hope to get three times the life.

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Sat, 13 Nov 2010, 17:45
steve_ancell
You seriously need to lose the resistors and fuses, as they wall cause the batteries to charge at different rates.

Mog is correct in stating that it will take longer to charge, it will take up to three times longer.

This is what you need.


Sun, 14 Nov 2010, 01:36
spinal
They were connected that way in the original store bought device, the unofficial batteries are a slightly different power rating to the official dsi battery, I am assuming the resistors even things out a bit.

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Sun, 14 Nov 2010, 05:56
steve_ancell
As long as the voltages are the same, you can still connect them the same way as I just said.

For example: If you have two batteries, one 850-mAh and 650-mAh and you connect them in parallel, the result will still be 1500-mAh and will charge-up as if they were one battery.

What actually happens, the circuit will use up the power from the bigger battery until the stored power is equal to the smaller one. Once that balance is reached, the stored power will remain equal, as energy will only flow into one battery to from other if one has less than the other, in other words, "Energy will flow, if there's somewhere to go!".
Sun, 14 Nov 2010, 06:11
CodersRule
I'm not an expert at electronics, but I'm fairly sure what steve is saying is correct.
If they're the same voltage, you should be fine butdontblamemeifyoupwnyourds