Part one – internal battery only:1. Without using an external battery the only other option I can see working is to minimize battery consumption. The only setting I can imagine helping with this is to "use shortcut key to sleep" in the battery intervalometer (other settings I am using are below for reference) however the PowerShot D20 does not appear to have a "shortcut" key. Might there be another way to put the PowerShot D20 into sleep mode?
I merged this with the other thread. As waterwingz says, having related questions spread over multiple threads just makes thing confusing.
I don't know off hand how the camera responds to varying voltage on the DC input. Maybe someone else does, or maybe you'll need to experiment. The battery voltage function does reflect external voltage, so if you are running a script you could have it shut down when the voltage gets to a certain level.
So all the regular Canon f/w things that relate to low voltage shutdown should apply and the use of an external battery supply should be fine.
Part two – external battery:With the thought that I will need to use an external battery source I purchased a 10000mAh external battery pack intended for cell phones and tablets (like: http://www.amazon.com/Battery-13000mAh-Portable-External-Cellphones/dp/B00K64WR9C/ref=cm_cd_al_qh_dp_t). I'm using a cable that goes from the USB output of the external battery pack to the DC input in the camera with the original Canon battery remaining in the battery slot (I'm using a cable like: http://www.startech.com/Cables/USB-2.0/USB-Adapters/3-ft-USB-to-Type-M-Barrel-5V-DC-Power-Cable~USB2TYPEM).
I am using an external battery 10,000 mAh plugged into the DC jack intended to be used with an AC adapter.I'm wondering how the camera will respond as the power begins to drain from the external battery. That is, I assume, the camera is designed to respond appropriately when the internal battery drains and no longer provides adequate voltage/amperage. However, because I am using the external DC power jack do you know if the camera will tolerate diminishing voltage/amperage as the external battery drains? Is the camera smart enough, as it is with the internal battery, to know when the external DC battery source is providing insufficient voltage/amperage and just shut off rather than getting damaged by remaining on with inadequate power levels?
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