1. Old batteries can be upgraded to v2.6. There is certain possibility of failure during upgrade for these batteries with loader of 1.3 or firmware of 1.6. The possibility is low but we don’t support these two version of batteries to eliminate the potential problem. If these users have already successfully upgraded to the v2.6, it’s totally fine.
They will have the same feature and functions as others who can upgrade to v2.6.
2. It is true that the “auto-discharge” function will activate automatically after 10 days of storage, given the condition that the battery does NOT operate during this period. This means even if you press the power button of the battery once, the battery will re-clock the time for 10 days. The battery will auto-discharge to 3.88V, corresponding to ~60% SOC. If cells in the battery are already below 3.88V, the auto-discharge will NOT activate. It turns off into deep sleep mode afterwards. If the battery is fully charged, the auto-discharge process will take around 2 days. The user will not notice the whole process cause the battery LEDs will not light up.
3. If the batteries fail with imbalanced cells or electrodes of certain cell detached from the pack, a warning notion will pop out on the camera screen (see the attached picture). In the log of the battery, the user can also browse the warning history during the previous use (see the attached picture).