I am thinking of creating an external battery pack for a camera which internal circuit works at 7.2v.
When shopping for cells I found this:
http://www.tmart.com/2pcs-Ultra-Fire-18650-3.7V-5000mAH-Lithium-Battery-Yellow_p191451.html
Two of this in series would offer 7.4v and 5000mAh, so it would give juice for quite a while to power the camera. Anybody has experience with these cells? Do these cells need circuit protection?
Also, I would like to add a custom battery fuel gauge indicator similar the one the macbooks pro use:
http://icdn6.digitaltrends.com/image/battery-indicator-macbook-pro-650x0.png
But I don't know where to start on creating something like that because I can only find already made ones that are too big or bulky.
Thanks
When shopping for cells I found this:
http://www.tmart.com/2pcs-Ultra-Fire-18650-3.7V-5000mAH-Lithium-Battery-Yellow_p191451.html
Two of this in series would offer 7.4v and 5000mAh, so it would give juice for quite a while to power the camera. Anybody has experience with these cells? Do these cells need circuit protection?
Also, I would like to add a custom battery fuel gauge indicator similar the one the macbooks pro use:
http://icdn6.digitaltrends.com/image/battery-indicator-macbook-pro-650x0.png
But I don't know where to start on creating something like that because I can only find already made ones that are too big or bulky.
Thanks