RC Lipos for mp3 player etc.

[mymacy]

Hey Guys,

i want to replace a lipo battery in my mp3 player and the best batteries i have found are made for RC. So they have a "C" rating of 20-40. Now I'm worried that this could cause troubles. The volt is same (3.7) and mAh is a bit highter which should increase battery life.
I have found out that mobile phone / mp3 / etc. Lipos usually have a C Rating of 1. So will RC high C Batteries work for other devices?

I guess the answer is yes but i want to be sure.. so any help is appreciated!

 

[Non Crimen]

Wait, so you want to Hook up a rc LiPo to a MP3 player? All I can say is have fun


Sent from my Pipboy-3000 in the Capital Wasteland.

 

[andydrew39219]

Are you sure the mp3 player you want to modify even has a Lipo battery in it? I thought it was more common for devices to have Li-Ion batteries.

 

[mymacy]

I'm talking about a battery like this

http://www.ebay.com/itm/helicopter-...Radio_Controlled_Vehicles&hash=item19d924caeb

its small, cheap, same V as mine and alot more mAh then mine..
the battery i removed has "lithium battery" written on it..it could be a li ion battery but exchanging it with a lipo shouldnt be a problem.. the ipod shuffle uses a Lipo Battery 100% sure..

the only thing I'm not sure about is the "C" rate...

 

[Non Crimen]

100% sure, eh? Li-ion no LiPo
http://support.apple.com/kb/ta26689


Sent from my Pipboy-3000 in the Capital Wasteland.

 

[trax de max]

it's only the iPads that's lipo.

 

[andydrew39219]

Honestly I'm willing to bet a most if not all of batteries in MP3s, etc are Li-ion. Lipos aren't as stable as Li-ion. Sure, when Li-ions were new, they could catch fire like Lipos (remember that? Nokia cell phones and I think some Dell laptops were busting into flames.) But I believe that was more because of some bad batches of batteries, instead of misuse from the owner.

I guarantee the battery you pulled that says "llitium" is a Li-ion. That's your number 1 problem right there. I'm sure that lipos have to be charged in a different manner than Li-ion. Not to mention with lipos you have to check and balance each cell.

You would have to remove the battery each time you wanted to charge. Not to mention getting the connector attached to the motherboard inside. It is different on everything but I have seen some weird ribbon connectors used on batteries in MP3s that I bet would be impossible/very difficult to disconnect then reconnect to a different battery.

Good idea though and if you ever find a solution let us know! I have a android tablet that has bad battery life.

What about buying a replacement battery for the mp3 player and soldering them into a sequence. I think that is what it is called, help me out guys. I have seen people do it with rc cars and multiple batteries.

 

[Greywolf74]

The C rating doesn't matter unless the c rating for a pack is to low for what its being used for but unless you have a way to detect Low Voltage on the lipo and you have a way of charging the lipo on a lipo charger than I wouldnt do it.

 

[andydrew39219]

unless you have a way to detect Low Voltage on the lipo

Yeah, I had forgotten about that too. Usually mp3 players will have the battery %. But I think changing the mah of the battery would probably throw that battery % off.

 

[mymacy]

heyhey thanks for the answers.. so i guess its not a good idea.. but I'm also confused.. i ordered an ipod shuffle replacement battery on ebay and it clearly says "Akku für Apple iPod Shuffle 4. Generation Li-Polymer 150mAh" (Akku = German for Battery)..

all i read about the subject said that li ion and li polymer are essentially the same with the difference being what seperates the lithium.. i never read that li polyer requires special charging.. i guess if i install the ipod lipo replacement battery into another mp3 i can't just simply charge it with the usb connector like before?

 

[Greywolf74]

If you charge it above 4.2V it can catch fire. Thats why LiPos have special chargers for them.

 

[trax de max]

The i pod will have it's own charging integrated charging circuit, the wall charger or usb charger that is supplied with it, is only the power supply supply for that circuit.
The lipo and lithium ion charge with the same algorithm. Life batteries are different.

 

[Greywolf74]

The lipo and lithium ion charge with the same algorithm. Life batteries are different.

From what I just read, this would seem to be the case and the two should be interchangable.

"Charging Li‑ion polymer, also referred as Li-polymer, is very similar to a regular lithium-ion battery and no changes in algorithm are necessary. Most users won’t even know if their battery is Li‑ion or Li‑polymer. The word “polymer” has been used as promotional hype and does not reflect special attributes other than to know that the battery is built in a different way to a standard Li-ion.
Most polymer batteries are based on a hybrid architecture that is a cross between Li-ion and Li-polymer. There are many variations within the polymer family, and the true dry polymer battery for the consumer market is still years away. Also know as the “plastic battery,” this system was first announced in early 2000 but was never able to attain the conductivity needed for most applications at ambient temperatures. Read more about the Lithium-polymer battery and the Pouch Cell."


http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries



Interesting read to say the least!

 

[trax de max]

yep, it's the life and A123's I keep getting confused with, that's why i don't use them.
With the lithium ion i'm not 100% sure if the low volatge maybe different and using a lipo instead of lithium ion the voltage may go too low for lipo. But again i'm not 100% sure on this.