Instict 2 solar Tactical

Thank you for your answer. Yes I know this manipulation... what I'm asking is it better to completely discharge the battery from time to time or if I keep the battery charged all the time at 100% will reduce its lifespan?

Battery tech is battery tech. Lithium ion is lithium ion. Personally I have heard charge to 80% and down to 20% are good limits. With solar you can't really abide by 80% limit. Id enjoy your watch because I am betting when i3 comes out, you'll get rid of the one you have

Good point thx

7009607 said:

if I keep the battery charged all the time at 100% will reduce its lifespan?

Yes

Nowadays with lithium batteries it's the number of charge cycles rather than the charging amount that matters. The general talk is of around 500 charge cycles so if you only charge once a week that's close to 10 years. However, there's conflicting information out there and much personal opinion. I'd just use it as you see fit. Most of us won't have the watch longer than 10 years.

There is plenty of reading on the topic available online. For example:

• A guide to lithium-ion battery charging best practices | Popular Science (popsci.com)
• Charging your lithium-ion batteries: 5 expert tips for a longer lifespan | Saft | Batteries to energize the world (saftbatteries.com)
  
• BU-409: Charging Lithium-ion - Battery University
• ...

And also Garmin self has some documents about batteries on their Support site. For example the article Expected Life of Lithium-ion Battery in a Rechargeable Garmin Outdoor Watch | Garmin Support, where they state the following:

There are factors that can accelerate the normal degradation of battery capacity including:

• Exposure to high temperatures

• Leaving the battery completely charged while connected to a charger, or completely discharged for long periods of time (anything longer than two weeks)

Honestly with all the bugs I won't buy a Garmin watch anymore... given the price I'm going to buy an automatic Swiss watch sooner... at least it's for life and no bugs!