sprockett
01-25-2005, 04:01 PM
Hi everyone, im intending to join a couple of Li-on batt packs in parallel for extra juice. I will be custom making an external enclosure for the extra packs and mount it on my camera.
Anyways, I noticed that there is a third contact on li-on batt packs. I was wondering what this was for, but have found out that its basically a battery fuel gauge that allows the camera to know how much juice there is left.
How did i find this out?
I have a cellphone li-on pack that also has this 3rd contact. I covered it and connected it back to the cell phone, and thats when i realized i lost my "smart battery gauge" the one that predicts how many hours left etc. It also lost the 1/8 battery increment meter. The meter just stated 0, 1/2 or Full.
Anyway, my question is does anyone noe how Li-on batts are configured? I know the base voltage of Li-on cells is 3.7v. so that means for batt packs that have 7.2v, they use 2x3.7 v in series, and so on.
In the series configuration, the overcharging / discharging circuit keeps track of each "cell" in the batt pack, so it won't allow uneven charging/discharging of the cells (for example, one cell being used up, while another remains full)
My question is if this applies in a parallel configuration as well. In a 2x850mah 3.7v configuration, are the 2x850mahs even considered "separate" cells? Or can i just lump them together and consider them ONE cell? One could think of it as just twice the amount of chemicals right? Because if i can make this assumption, i can manually solder 2x850mahs together in parallel.
Appreciate any answers! Thanks!
Anyways, I noticed that there is a third contact on li-on batt packs. I was wondering what this was for, but have found out that its basically a battery fuel gauge that allows the camera to know how much juice there is left.
How did i find this out?
I have a cellphone li-on pack that also has this 3rd contact. I covered it and connected it back to the cell phone, and thats when i realized i lost my "smart battery gauge" the one that predicts how many hours left etc. It also lost the 1/8 battery increment meter. The meter just stated 0, 1/2 or Full.
Anyway, my question is does anyone noe how Li-on batts are configured? I know the base voltage of Li-on cells is 3.7v. so that means for batt packs that have 7.2v, they use 2x3.7 v in series, and so on.
In the series configuration, the overcharging / discharging circuit keeps track of each "cell" in the batt pack, so it won't allow uneven charging/discharging of the cells (for example, one cell being used up, while another remains full)
My question is if this applies in a parallel configuration as well. In a 2x850mah 3.7v configuration, are the 2x850mahs even considered "separate" cells? Or can i just lump them together and consider them ONE cell? One could think of it as just twice the amount of chemicals right? Because if i can make this assumption, i can manually solder 2x850mahs together in parallel.
Appreciate any answers! Thanks!