1] VOLTAGE: 3.6V or 3.7V - 18650 Li Ion Batteries
Are all 18650 lithium ion battery cells 3.6 or 3.7 volts or do they differ? I want to replace my current SIGMA DP2 photocamera battery (3.7 1300mAh) with a 18650 2900 mAh battery, sometimes rated 3.6V sometimes 3.7V. (I am not sure whether information provided on eBay is accurate as I have seen conflicting data.)
2] Possible Voltage Shortage?
Does it matter for my project or can i use 3.6 without any Voltage shortage for the camera? In other words, do all 3.6/3.7V li ions use the same way therefore the given voltage is just the same or do they really differ?
3] Fundamental Reason for this Voltage Range
Why do we see only 3.6/3.7 V per Li Ion Cell, and never 3.0V or 4 V per cell? I am very curious...
4] Parallel Cell Charging - One BIG Li-Ion Battery Pack
I was thinking of putting two, or three of those Panasonic/Sanyo 18650 Li Ion cells in parallel, soldering together from the instant the are new, that way giving me about 5800 mAh (2 pcs x 46 grams = 92 grams) or about 8700 mAh (3 pcs x 46 = 1 grams) very light. Equaling to bypassing seven orso charges with my old li ion battery. Is this correct?
5] Charging... How?
I found a nice small cheap charger about 30~40$ called Turnigy Accucel-6 (there is also an Accucel-8 for double price and double weight) . Could I attach the + to + of all the cells and the - to all the - poles of the cells without needing any extra in-between-wiring?
Thanks a lot for your opinion.