Hi all,

I'm looking for a suitable battery to power my project, obviously I want very lightweight, small dimensions and everlasting power!

After hunting through the rs website and not really finding much, it was onto ebay, replacement ipod batteries look quite tempting, my project uses a pic and a few i2c components along with a rf module, the rf will only be on for a short period and draws around 25mA, everything else is very low power.

Has anyone used ipod batteries? mobile phone ones look good too but some of the ipod batteries have leads on them, and looking at the pictures seem to have a charging circuit built in?

Dimensions would be handy too? google didn't turn much up regarding size. I have 55x35x6 mm avalible

Cheers Geoff

 

Not a lot of room. How about this one?

http://www.all-battery.com/TenergyLi-Polymer3.7V680mAh603040Battery-30191-0.aspx

Check out the RC places. There are electric planes now.

 

Thanks Ron,

Looks good, the only problem I can see is the minimum order of 1000 pieces! I don't know much about batteries, what type am I best to go for, do li po ones, (like the ipod or Rons) hold their charge over a long period?

It will be mainly very low draw with a perhaps daily turn on of the rf module. I'd like it to last as long as possible between charges, I'd prefer it not to catch fire when I'm charging?! , (is that a myth of past li po's?)

Cheers Geoff

 

For self discharge the old non rechargeable batteries are best, then lipo.

http://www.batteryeducation.com/2012/10/battery-self-discharge-rates.html

If you Google the battery part number you can find one prices.

 

"BGMicro", has some pretty good deals on Lipos right now.

 

Hi all,

I'm looking for a suitable battery to power my project, obviously I want very lightweight, small dimensions and everlasting power!

After hunting through the rs website and not really finding much, it was onto ebay, replacement ipod batteries look quite tempting, my project uses a pic and a few i2c components along with a rf module, the rf will only be on for a short period and draws around 25mA, everything else is very low power.

Has anyone used ipod batteries? mobile phone ones look good too but some of the ipod batteries have leads on them, and looking at the pictures seem to have a charging circuit built in?

Dimensions would be handy too? google didn't turn much up regarding size. I have 55x35x6 mm avalible

Cheers Geoff

You need to state the average current draw and how long it has to run to pick a battery.

 

Thanks Ron,

Looks good, the only problem I can see is the minimum order of 1000 pieces! I don't know much about batteries, what type am I best to go for, do li po ones, (like the ipod or Rons) hold their charge over a long period?

It will be mainly very low draw with a perhaps daily turn on of the rf module. I'd like it to last as long as possible between charges, I'd prefer it not to catch fire when I'm charging?! , (is that a myth of past li po's?)

Cheers Geoff

There is a cheap rechargeable Li coin cell called LIR2032 that is used in the billions of handheld flashlights made every year. I think they are rated about 20 - 30 mA-hr and are available everywhere pretty cheap.

example:

http://www.ebay.com/itm/like/221124725723?lpid=82

 

Thanks Ron,

Looks good, the only problem I can see is the minimum order of 1000 pieces! I don't know much about batteries, what type am I best to go for, do li po ones, (like the ipod or Rons) hold their charge over a long period?

It will be mainly very low draw with a perhaps daily turn on of the rf module. I'd like it to last as long as possible between charges, I'd prefer it not to catch fire when I'm charging?! , (is that a myth of past li po's?)

Cheers Geoff

Look a little further on that site, there are plenty of batteries like that one that they sell quantity one for about $5.

Bob