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OSTC Sport - Erratic battery readout in subsurface
Posted by: mapoubelle ()
Date: February 10, 2019 09:33PM

Hello,

I have following values in subsurface for "battery at end". The readings seems quite odd to me...
05/02 dive 1: 3.23V 74%
05/02 dive 2: 3.24V 72%
06/02 dive 1: 3.11V 70%
06/02 dive 2: 3.18V 68%
07/02 dive 1: 3.00V 75% --> % seems strange to me
07/02 dive 2: 3.21V 64%
07/02 dive 3: 3.11V 62%
08/02 dive 1: 2.96V 75% --> % seems strange to me
08/02 dive 2: 3.06V 57%
09/02 dive 1: 2.89V 50%
09/02 dive 2: 3.26V 52% --> Voltage seems odd
10/02 dive 1: 3.05V 50%
10/02 dive 2: 2.92% 75% --> % seems strange to me

OSTC #10369 FW10.41

Any views on this is more than welcome.

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Re: OSTC Sport - Erratic battery readout in subsurface
Posted by: jlm ()
Date: February 10, 2019 10:09PM

As you mention Subsurface ... did you verify the data in the logbook on the device itself?

--jan

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Re: OSTC Sport - Erratic battery readout in subsurface
Posted by: mapoubelle ()
Date: February 10, 2019 10:29PM

I just checked. All is in line between Subsurface and OSTC Logbook
Actual reading on the OSTC is 3.0V 47%

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Re: OSTC Sport - Erratic battery readout in subsurface
Posted by: jlm ()
Date: February 10, 2019 11:25PM

So, just to be clear. The OSTC Logbook also shows the strange 75% values on the mentioned dives?

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Re: OSTC Sport - Erratic battery readout in subsurface
Posted by: mapoubelle ()
Date: February 11, 2019 01:44AM

yes.

Note I just made a dive, after the dive I had 75%
a few minutes later the OSTC claimed the battery was at 0%
The dive has not been saved in the logbook... The OSTC complete skipped the dive...

Decided to change the SAFT battery....



Edited 2 time(s). Last edit at 02/11/2019 01:47AM by mapoubelle.

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Re: OSTC Sport - Erratic battery readout in subsurface
Posted by: heinrichsweikamp ()
Date: February 12, 2019 09:40AM

Hello,

The OSTC sport computes the battery percent on the known consumption (Screen brightness, compass, etc). In order to work with bad batteries or not-full when inserted batteries there are several voltage-dependent thresholds for the Saft battery, all based on the worst case current consumption of about 70mA:
3.0V=75%
2.9V=50%
2.6V=25%
2.5V=10%

I'd assume the battery you used was either one of the counterfeit Saft batteries around, see [www.shearwater.com] (We had these here many times in customer complaints already...), a battery that was not full or a contact issue between the battery cap and the housing. Also, an update to the latest 10.51 is recommended.

regards,
Matthias

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