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Buzz_




Joined: 19 May 2007
Posts: 413

PostPosted: Mon Nov 12, 2018 4:05 pm    Post subject: Reply with quote

doug wrote:
Having worked as a developer of (non Garmin) gps sports watches, you want to turn off everything you don't use:
- OHR a big battery hog, can reduce battery life by about 10% over a chest strap
- bluetooth, this can be especially bad if you are linked to your phone and then go out of range as it will keep trying to connect, best to turn it off
- backlight, set the timeout as short as possible and to the lowest brightness
- glonass uses a different set of frequencies to gps so uses an extra RF stage, the signal is also encoded quite differently so again uses extra juice
- vibrate alerts, the vibe motor is power hungry so keep these alerts to a minimum
- navigation, having nav turned on is not too bad, but don't keep it on the trail screen as this uses extra cpu cycles to draw/rotate the trail

Do all that and you might get close to the advertised battery figures on a relatively new watch.

This is all really good information, but why doesn't the watch just have a low power mode where all this is set for you? Or a custom power mode where you can select which features to leave on or turn off? Much easier than changing a dozen settings in swim, bike and run modes, forgetting which modes to set the night before your long distance event and only remembering halfway round the bike. As most people only do 1 or 2 >12hr events a year, it's not the sort of information you are going to remember easily.

From memory, there is a (non-garmin) device targeted at trail running that does this. Would have thought it should be fairly standard.
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FatPom




Joined: 26 Dec 2005
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PostPosted: Mon Nov 12, 2018 4:11 pm    Post subject: Reply with quote

Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.
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jibberjim




Joined: 15 Aug 2008
Posts: 8365
Location: Kingston

PostPosted: Mon Nov 12, 2018 4:17 pm    Post subject: Reply with quote

FatPom wrote:
Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.


There is, the fenix 5/935 battery is huge, lasts ages.
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Davem




Joined: 11 Oct 2005
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Location: Out of retirement...

PostPosted: Mon Nov 12, 2018 4:23 pm    Post subject: Reply with quote

jibberjim wrote:
FatPom wrote:
Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.


There is, the fenix 5/935 battery is huge, lasts ages.


Bought a Fenix 5 - battery is pretty good - lasted for my 12:40 IM Smile and was still good for a few days after just working as a watch!!
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stenard




Joined: 04 Sep 2013
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PostPosted: Mon Nov 12, 2018 4:47 pm    Post subject: Reply with quote

FatPom wrote:
Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.

The 735 was effectively released as a "multisport light" watch. It had smaller battery, no quick release kit, no barometric altimeter, no wifi, etc.

Realistically, they had to cut the battery life in an effort to protect their sales of the higher end watches. I always saw the 735 as a way of trying to get runners who occasionally swim/bike to spend a bit more. That said, for anyone not doing full distance, it's probably the best value tri watch Garmin have ever released.
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Buzz_




Joined: 19 May 2007
Posts: 413

PostPosted: Mon Nov 12, 2018 5:02 pm    Post subject: Reply with quote

stenard wrote:
I always saw the 735 as a way of trying to get runners who occasionally swim/bike to spend a bit more.

Or a way to persuade ironman athletes they need to train harder and speed up. The new benchmark performance - finish within the battery life of a 735..
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stenard




Joined: 04 Sep 2013
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PostPosted: Mon Nov 12, 2018 5:24 pm    Post subject: Reply with quote

Buzz_ wrote:
stenard wrote:
I always saw the 735 as a way of trying to get runners who occasionally swim/bike to spend a bit more.

Or a way to persuade ironman athletes they need to train harder and speed up. The new benchmark performance - finish within the battery life of a 735..
Very Happy
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Jorgan




Joined: 12 Nov 2007
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PostPosted: Tue Nov 13, 2018 9:02 am    Post subject: Reply with quote

stenard wrote:

Or a way to persuade ironman athletes they need to train harder and speed up. The new benchmark performance - finish within the battery life of a 735..


That's my plan for 2019...let's see!
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iwaters




Joined: 06 Sep 2016
Posts: 435

PostPosted: Tue Nov 13, 2018 9:32 am    Post subject: Reply with quote

Davem wrote:
jibberjim wrote:
FatPom wrote:
Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.


There is, the fenix 5/935 battery is huge, lasts ages.


Bought a Fenix 5 - battery is pretty good - lasted for my 12:40 IM Smile and was still good for a few days after just working as a watch!!


What do you think of the Fenix 5? I really like the look of it but its eye-wateringly expensive.
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gingerbongo




Joined: 21 Sep 2012
Posts: 1668
Location: Devon

PostPosted: Tue Nov 13, 2018 11:23 am    Post subject: Reply with quote

Jorgan wrote:
stenard wrote:

Or a way to persuade ironman athletes they need to train harder and speed up. The new benchmark performance - finish within the battery life of a 735..


That's my plan for 2019...let's see!


Aren't you doing a half? Wink
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Buzz_




Joined: 19 May 2007
Posts: 413

PostPosted: Tue Nov 13, 2018 2:42 pm    Post subject: Reply with quote

stenard wrote:
I know one person who has the multisport mode set to indoor bike mode for IM, that way she gets full race time info, plus total TSS info etc, but can upload a bike gps file for strava purposes.

This is a neat solution, and the cost saving of 735 over 935 you could buy an edge and still be quids in.
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Jorgan




Joined: 12 Nov 2007
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PostPosted: Tue Nov 13, 2018 3:14 pm    Post subject: Reply with quote

Buzz_ wrote:
stenard wrote:
I know one person who has the multisport mode set to indoor bike mode for IM, that way she gets full race time info, plus total TSS info etc, but can upload a bike gps file for strava purposes.

This is a neat solution, and the cost saving of 735 over 935 you could buy an edge and still be quids in.


Fudge me, that sounds like quite a good idea.

That said, I'm going to retire from Ironman, the day I can't finish one within the battery life of a 735XT. Life goals Very Happy
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stenard




Joined: 04 Sep 2013
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PostPosted: Tue Nov 13, 2018 3:31 pm    Post subject: Reply with quote

Jorgan wrote:
Buzz_ wrote:
stenard wrote:
I know one person who has the multisport mode set to indoor bike mode for IM, that way she gets full race time info, plus total TSS info etc, but can upload a bike gps file for strava purposes.

This is a neat solution, and the cost saving of 735 over 935 you could buy an edge and still be quids in.


Fudge me, that sounds like quite a good idea.

That said, I'm going to retire from Ironman, the day I can't finish one within the battery life of a 735XT. Life goals Very Happy

That's a strong statement. Given my real world testing has shown the 24hr battery life of a 920xt actually results in 14hrs, the same drop off in the 735 battery life would require you to break 8hrs10!

EDIT - that is with the watch being 2yrs old, so a new 735 would get a bit more. But Whisk and others have implied it's not even up to 12hrs, so with a bit of age, that will quickly fall below 10 Razz
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gingerbongo




Joined: 21 Sep 2012
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PostPosted: Tue Nov 13, 2018 3:52 pm    Post subject: Reply with quote

stenard wrote:
Jorgan wrote:
Buzz_ wrote:
stenard wrote:
I know one person who has the multisport mode set to indoor bike mode for IM, that way she gets full race time info, plus total TSS info etc, but can upload a bike gps file for strava purposes.

This is a neat solution, and the cost saving of 735 over 935 you could buy an edge and still be quids in.


Fudge me, that sounds like quite a good idea.

That said, I'm going to retire from Ironman, the day I can't finish one within the battery life of a 735XT. Life goals Very Happy

That's a strong statement. Given my real world testing has shown the 24hr battery life of a 920xt actually results in 14hrs, the same drop off in the 735 battery life would require you to break 8hrs10!

EDIT - that is with the watch being 2yrs old, so a new 735 would get a bit more. But Whisk and others have implied it's not even up to 12hrs, so with a bit of age, that will quickly fall below 10 Razz


Battery pack attached to the front of the bars!
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Davem




Joined: 11 Oct 2005
Posts: 6149
Location: Out of retirement...

PostPosted: Tue Nov 13, 2018 4:04 pm    Post subject: Reply with quote

iwaters wrote:
Davem wrote:
jibberjim wrote:
FatPom wrote:
Quote:
That's to be expected from the 935. It's got a stated battery life of more than 24hrs hasnt it?


I'm not sure i ever looked it up but am surprised there is such a difference between models.


There is, the fenix 5/935 battery is huge, lasts ages.


Bought a Fenix 5 - battery is pretty good - lasted for my 12:40 IM Smile and was still good for a few days after just working as a watch!!


What do you think of the Fenix 5? I really like the look of it but its eye-wateringly expensive.


I paid 385 for the Fenix 5 off Amazon - I thought that was a good price? Just looked at 935's which appear to be more?

(Fenix 5's are now 349 on Amazon)
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