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considerations for SX260 external power supply for time lapse situations

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Offline udo

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #20 on: 30 / August / 2015, 10:59:39 »
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Quote from: c_joerg on 30 / August / 2015, 07:29:32
My G1x needs 7,4V. Would be interesting to know, if 2 of them in serial connection will work with G1x. Why not…
Should work.
Just add extra connectors to put the batteries in series.
(and be sure to remove these DIY interconnects before charging)
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Offline c_joerg

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #21 on: 30 / August / 2015, 11:26:59 »
So the power bank includes 18650 cells, which are protected against Short circuit, overcharge and deep discharge (inside the cells).
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However you need too be very sure to completely separate them before you attempt to recharge them.
You are right. Charging via USB connector is a problem, when the 2 power supplies have no galvanic isolation (when they coming from same source with ground connection).
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Offline waterwingz

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #22 on: 30 / August / 2015, 12:16:35 »
Quote from: c_joerg on 30 / August / 2015, 11:26:59
You are right. Charging via USB connector is a problem, when the 2 power supplies have no galvanic isolation (when they coming from same source with ground connection).
If you know what you are doing,  it is possible to build a charger that will work with the units & camera connected.  But if you just try hooking up a standard end-user charger (like the ones built into the battery bank) then you will have problems.
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Offline c_joerg

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #23 on: 30 / August / 2015, 12:31:40 »
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If you know what you are doing,  it is possible to build a charger that will work with the units & camera connected.  But if you just try hooking up a standard end-user charger (like the ones built into the battery bank) then you will have problems.
I would not try to charge them together, for security I would always separate them…
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Offline udo

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S110 does not turn on when connected to powerbank
« Reply #24 on: 04 / September / 2015, 10:03:06 »
So I also got a fake battery of the NB5L type for the S110.

Strangely the S110 does not turn on when connected to the powerbank using the same cable that I can use to power the sx260hs from the powerbank.
I measure 4.1 volts over the fake battery contacts, with the correct polarity.
So what is wrong here?
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Offline waterwingz

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Re: S110 does not turn on when connected to powerbank
« Reply #25 on: 04 / September / 2015, 10:52:01 »
Quote from: udo on 04 / September / 2015, 10:03:06
So I also got a fake battery of the NB5L type for the S110. Strangely the S110 does not turn on when connected to the powerbank using the same cable that I can use to power the sx260hs from the powerbank.
I measure 4.1 volts over the fake battery contacts, with the correct polarity. So what is wrong here?
The NB-5L and NB-6L both have a nominal output voltage of 3.7V so 4.1V is a little high.   However, I don't think that would stop the S110 from working.

Give that you have measured the correct voltage at the NB-5L fake battery terminals,  my next suggestion would be to make sure the fake battery contacts line up in exactly the same spot as a real battery.  Especially their depth relative to the top of the battery.  It might be possible that it's simply not making contact when the fake battery is inserted into the camera? 

One other option is to recognize that your measurement was made "open circuit" so if there is a high resistance series connection in your circuit, the actual voltage delivered to the camera when the battery is inserted could be quite a bit lower.
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Offline udo

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #26 on: 04 / September / 2015, 11:03:10 »
The powerbank I do trust as the sx260hs fires right up using the very same cable.
The fake battery contacts might be a tiny tad lower (sunken into the battery) than those of an actual NB5L battery.
I could use a small amount of solder to 'fix' that, but would that be the right approach?

Pressing onto the fake battery with the batery door open does not help.
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Offline waterwingz

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #27 on: 04 / September / 2015, 11:13:11 »
Quote from: udo on 04 / September / 2015, 11:03:10
The powerbank I do trust as the sx260hs fires right up using the very same cable.
While it's not too likely,  the circuitry in the S110 might be a bit different and shut down on the 10% over voltage from the powerbank.

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The fake battery contacts might be a tiny tad lower (sunken into the battery) than those of an actual NB5L battery. I could use a small amount of solder to 'fix' that, but would that be the right approach?
I'm not a big fan of using solder that way as the surface tends to tarnish quickly, leading to a higher resistance contact.  But it might work to tell you if that's the problem. Another approach might be to gently bend the contacts up a bit (if that is possible).

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Pressing onto the fake battery with the battery door open does not help.
The camera will not start with the battery door open (unless you also press the secret battery door switch - harder to do on some cameras than others). There is a CHDK hack that will allow the camera to start with the battery door open.  Unfortunately it was decided not to make this a standard CHDK feature some time ago so you'd need a custom built to use it.  In any case,  if the battery top contacts the inside of the battery slot before the contacts engage then pressing harder won't help anyway.

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Offline c_joerg

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #28 on: 04 / September / 2015, 12:27:19 »
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the circuitry in the S110 might be a bit different and shut down on the 10% over voltage from the powerbank.

When you trust this information, then more than 5V is not a problem.

http://chdk.setepontos.com/index.php?topic=12381.10

May be the current on start up is a problem when the contacts not really fit.
« Last Edit: 04 / September / 2015, 12:29:04 by c_joerg »
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Offline udo

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Re: considerations for SX260 external power supply for time lapse situations
« Reply #29 on: 06 / September / 2015, 03:11:59 »
The powerbank can power the sx260hs well enough so I am not yet convinced that current delivery is an issue.
I added some solder to the fake battery contacts to be sure it is not a contact issue, yet the S110 does not turn on when connected to the powerbank...

To test the overvoltage hypothesis I should test with a variable resistor in series to see if a voltage drop helps?
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