Q. How do I relate amp-hour rating, say 6,000 mAh, to battery
capacity in Wh in the case of a Panasonic DVX100 battery?
A. Multiply the Ah number by the battery voltage (7.2V nominal for the Panasonic DVX100 camera).
In this example 6 * 7.2 = 43.2 Wh
Q. How much run time can I expect to get from a battery?
A. Run time is calculated by dividing the Wh rating of a battery by a camera's power consumption. In the case of a DVX100, its power consumption is about 8W. Dividing 43.2 Wh by 8W results in about 5.5h calculated run time. Manufacturing variations and aging may result in slightly different actual results. Your mileage may vary.
Instant run time calculator (just enter mAh or Ah battery capacity and camera power drain numbers)
Instant run time calculator (just enter WH battery capacity and camera power drain in W)
Q. Do I need to discharge my Li-Ion battery before charging? A. Li-Ion chemistry does not benefit from discharging. Doing so does not make it last longer, and deep discharge will shorten Li-Ion battery life cycle.
Deep discharge vs. shallow discharge
Discharge at different current rates
Interpreting "C" : While discharging at 1C it takes a battery 1 hour to fully discharge; discharging at 1/2C takes 2 hours; discharging at 2C takes 1/2 hour.
Q. My camera requires 7.2V DC power, but the battery I want to use is 7.4V. Will it work? Is it OK to use a 7.4V Li-ion battery to replace a 7.2V battery?
A. All Li-Ion DV batteries measure up to 8.4V for the fully charged, down to about 6V discharged. This is true for any brand, make, model. It has something to do with how the Li-Ion chemistry works. All modern smaller size cameras are designed to operate in this range (6V-8.4V). This is true no matter what the label says (7V, or 7.2V, or 7.4V). In other words, labeling for the camera voltage is just that - labeling. Actual voltage depends on the battery state of charge.
This is also true for the larger cameras like Sony EX1/EX3, and any other models using Anton Bauer or V style batteries. The batteries are usually called 14.4V, the camera power specification often calls for either 12V or 14.4V. In any case all larger Li-Ion batteries operate in 12V-16.4V range (a freshly charged battery is 16.4V, discharging down to ~12V).
Q. Do Li-Ion batteries have "memory"?
A. Li-Ion chemistry is inherently memory free
Q. What is "battery memory"
A. This effect was first discovered in the early days of Ni-Cad chemistry. Since that time the "memory effect" has sometimes been misunderstood and exaggerated. Please refer to this article
Q. My battery has started to expand, specifically the plastic case is expanding on the top and the bottom, can I still use it?
A. We recommend discontinuing the use of this battery as these are signs of imminent failure.
Q. My battery does not last more than a few minutes. Can this be fixed?
A. Li-Ion batteries can not be rejuvenated by charging/discharging them, or using any other "tricks." Expect 2-3 years of service before run time deteriorates.