08-26-2019 01:39 PM
Thanks. I think it provides corroboration that these expensive little guys (I have 6 of them, all branded official Canon batteries, all made in China) can be problematic if we don't maintain some kind of means to ensure we check their status periodically to ensure they are still "healthy" , able to take a charge, able to retain a charge, and are, indeed, charged when we need to rely on them. Thanks for substantiation. The other items in this thread give a lot of important info on this topic. DQ
08-26-2019 10:06 PM
Thanks to all. This afternoon saw a visit by a beautiful hummingbird. I fetched my 7D2 with 300 4/fL IS and 1.4x, turned the body on, and (wait for it!) nothing happened. Turns out that this battery was also totally discharged without my being aware of it -- as was the battery in my other 7D2. That makes 5 out of 6 LP-E6N batteries that were depleted (three in active camera bodies) at one time. Is it time for Canon to question the quality of this cell, and perhaps consider a recall or at least credit toward a new, improved version of this battery? The original LP-E6 that came with my 7D (not MkII) does not seem to have this problem.
Issue#2: we are told not to store fully-charged batteries. Does this mean we need to remove the battery from the charger as soon as the 75% winking light comes on, instead of letting it run a bit longer? What is a bit longer? If this is so important, why do the Canon chargers not have a percent charge meter on them other than just the blinking winking lights. Canon could then come out with a sensible recommendation that batteries should be charged until they are 89.65% "full, " or some such. Why tell us not to charge them fully without telling us how to quantify and measure that?
10-17-2019 02:25 PM
Lithium based cells storage is optimal on 20% charge which means 7.4 volts on a two cells 7.2 volts pack, like the LP-E6 [N]. Professional chargers / dischargers (Like IMAX B6AC - beware of it's clones!) have "storage mode" which discharges / charges the cells to 7.4 volts (depends on the level of the actually held charge). 7.4 volts indicates 50% battery level in my 5D3, 55% battery level in my 5D4 - you can correlate to that.