forum.heinrichsweikamp.com

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.

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

--jan

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

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

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....

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 https://www.shearwater.com/announcement ... batteries/ (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