hi Everybody!
I would like to buy a bigger battery for the battery shield, do you have any links where can i do that and which model should i take? Any 3.3V would do?
Thx,
Noten
Hi @Noten,
I think most 3.7v Lithium Polymer batteries with JST connectors will work, Sparkfun has lots!
https://www.sparkfun.com/search/results?term=Polymer+Lithium+Ion+Battery+JST+3.7v
Thanks!
David
Oh no, now you’ve got me wondering how long I could run a core off one of these 
https://www.sparkfun.com/products/8484
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Will check it out and post the results 
Thanks Dave!
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Remember to triple-verify the polarity of the connector on any battery you choose to plug in!!
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I’ve been using these UltraFire 18650 4Ah batteries for various projects and they work great! They are super cheap and have a protection circuit built in. The ones with protection circuits say BRC on them.
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what holder/socket are you using for the Ultrafire?
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If you search ebay for 18650 battery holder you will find a bunch. I bought some from ebay and have found that some are too tight though (these might be meant for batteries with no protection circuit), so if you find a good source of battery holders let me know! The chargers are cheap too.
Edited @Dave’s post above - the batteries should be 3.7V, not 3.3V (as previously shown)
Thank you!
(surplus characters here)
I picked up a Fuel+ at Fry’s Electronics to power the Core. It was $15, And the awesome color of white matches the Core. 
So Happy.
http://www.frys.com/product/7833999?site=sr:SEARCH:MAIN_RSLT_PG
2200 mAh
recharges in about 2 hours with USB power adapter, longer on a computer USB port.
Thermal & Short shutdown
Low Voltage cutout protection
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Best Deal I have found so far. It recharges at 2 amps also which is as fast as it gets.
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I really wish I had money to buy everything awexome I see! 
Both of those battery packs are really attractive and I could use them for lots of stuff. Thanks for sharing.
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Anyone had tested, how long these 2200mAh cell will able to power up the core ?
Give or take… probably 6 hours? If the core goes to sleep and wakes up on a schedule, that’s gonna be wayyyy longer 
I’ve been doing some battery tests here at the office, I think a 2200mAh battery should last about 12-13 hours of active transmitting without any kind of sleep / optimization, give or take.
Thanks,
David
Hi @BDub
Do you still use those batteries(the Ultrafires)? I’m looking for improvements over the default LiPo for a solar powered application. Those have really good battery life but how well do they stand up to the trickle charging and cycling of the Electron battery management?
@mohit, can you please enlighten on how to do that triple verification?
don’t just double check but do it three times
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