Why is this not more common for mods?

[namuch]

I just built a mini 5v mod, that is working great with 2x 10440 protected batts in a tiny 4xAAA case. Looks like my battery life has exceeded my expectations so far for a whopping $9 or so in parts. But I'm on a quest for 5v mods that last even longer, and are still relatively tiny.

Looking around, I have noticed these:
iPower 9V Rechargeable Lithium Polymer Battery 500mAh

Combine with this:
Battery Holder for 9 Volt Holder with Sliding Cover and Switch, 6" 26AWG Wires - RoHS Compliant

and a standard 5v regulator, seems like the 500mah on the 9v parts would last considerably longer than the 2 360mah I'm using with the 10440's.

This would still be a very small package, since from the measurements this would be just a little thicker, a little longer, but narrower than my 4xAAA box.

Does using a 9v transistor battery like this set off any alarms for anyone?

Also, seems like you can use a regular 9v duracell, energizer, or whatever as an emergency backup, even though the mah rating on those are about 1/2 of the LiPO claimed in the link above.

 

[Chris Brown]

Our singers use batteryjunction com /ipowerus-9v-520.html (iPower PRO Rechargeable 9V Lithium Polymer Battery 520mAh) in their wireless packs which are very picky about batteries.

I haven't done any mods yet but I'm about to start working on 2 5v mods for wife and I.

It seems like one of these and a 5.1v zener diode would provide a steady 5.1v... I've used something like this for audio applications... I have been building guitar fx for 5 years so I'm really looking forward to getting in to the mod thing.

 

[Chris Brown]

Now that I think about it I'm not sure that 500mah is enough.

 

[namuch]

500mah is quite a bit in contrast to the average of 360 for most e-cig bats. The 360's i'm using lasted almost a full day at 5v, but i'm not sure how the mah rating is working in this case.
Was I getting the benefit of 2x360? Or, because of the fact that are used in series to generate 5v, did I actually net 360?

The parts to build the 9v are very cheap, so I went ahead and ordered the box. Since the 9v 500mah batteries are pretty steep, I figure I'll just try some regular alkaline 9v batts in the mod to see if I can tell how long they last before I invest money in the LiPO 9v rechargables and the charger.

According to this site:
Discharge tests and capacity measurement of 9 volt transistor radio batteries

the energizer 9v's I have laying around should be good for 230mah at 1A, so I should be able to get a feel for lifetime of 9v batts used in this application.

Hopefully someone else will chime in on this thread with some insight or past experience so I don't waste my time....

 

[opuscroakus]

Good luck getting the atty connector, switch and 5v regulator to fit in the space where the slider switch is. It barely fits in a 2xAA box and what you are going to try is significantly smaller. If you can make it fit, and work, you just have to post pics.

As for testing, I don't think a regular 9v is going to cut it if it is providing 1A. The 510 draws ~2A at 5v.

 

[namuch]

I'll post pics of my 4xAAA 5v mod soon, I had way less room to work in there than I will in the 9v box. The one I linked is pretty roomy according to the specs. The only thing I don't like about my 4xAAA mod is the switch, which sticks out like a sore thumb, but at least it has the slider cut-off switch to prevent accidental pocket fires.

Also, I think I mentioned somewhere else, that I'm building these mods specifically for Kr808/901 usage, so that might be why I'm getting more mileage out of them than what might be expected.

Hopefully, I'll have the 9v box in by this weekend or early next week, and I can start hackin'....

 

[codfish124]

this would be a better battery Primary Lithium Battery: 9V 1200mAh (10.8Wh) Compatible with Energizer L522-9V / Ultralife, L522 - UL & UN approved

but the box that you linked has really no room for a diode/ switch/ on off switch/ and an atty connector. now i don't know how big the diode is but you might shop around and find stuff that will fit in the space allowed. 1 thing that might help is if they have room for the battery to slide up and plug in then you could make the plug move and take advantage of that room.

 

[opuscroakus]

I'll post pics of my 4xAAA 5v mod soon, I had way less room to work in there than I will in the 9v box. The one I linked is pretty roomy according to the specs. The only thing I don't like about my 4xAAA mod is the switch, which sticks out like a sore thumb, but at least it has the slider cut-off switch to prevent accidental pocket fires.

Also, I think I mentioned somewhere else, that I'm building these mods specifically for Kr808/901 usage, so that might be why I'm getting more mileage out of them than what might be expected.

Hopefully, I'll have the 9v box in by this weekend or early next week, and I can start hackin'....

I checked the specs of your 9v box against those of the 5v 2xAA box that I did and they are the same. That will give you room to put in a small switch, atty connector and 5v regulator but you will have to lose the sliding on/off switch. If you really do get this working I would like to see some pics.

 

[Ultimist]

this would be a better battery Primary Lithium Battery: 9V 1200mAh (10.8Wh) Compatible with Energizer L522-9V / Ultralife, L522 - UL & UN approved

This battery isn't rechargeable, though... so that is something to keep in mind.

 

[richardf]

Chris,
I thought about a zener diode mod, but the zener would have to be a minimum of 8 watts. I found a 10 Watt 5.1 Volt zener, but it was expensive, and bolt mount. I went back to regulators / boosters to get to 5 volts.