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Extremely slow charging from AC, fast with Battery Pack

I have a Garmin Instinct Dual Power (Japanese version of the Instinct Solar) and I noticed it is charging super slow.
I tried several wall chargers (Samsung 2A quick charge, Samsung old 1A charger, unbranded charger) and my watch charges very slow.
Instead, if I charge the watch with my battery pack (Anker, 20,000 mAh) it is much faster.

Some numbers:
- Wall charger in 20min from 35% to 43% = 0.4% per minute
- Battery pack in 30 min from 43% to 72% = 0.97% per minute

I find this behaviour rather disturbing as the watch (and not the charger) should be able to regulate the charging speed (hence the power/current absorption).
Can this issue be solved by a firmware update?
Anyone else experiencing something similar?

Thank you for your help,
Giordano

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0 trux over 5 years ago

And how does it look when you charge it from an USB port of a computer? BTW, that\s what Garmin recommends.

0 Gio over 5 years ago

I tested it with my laptop. It only has usb-c ports, so I tried two different adapters which show a significant difference:

- USB-A adapter with AC power delivery: in 14 min from 66% to 71% = 0.36% per minute

- USB-A single adapter: in 13 min from 71% to 81% = 0.77% per minute

I did the same test with charging my phone and the charging time was identical from the two different adapters.

Is there a way to solve this watch issue?

Thank you for your help, Giordano

0 trux over 5 years ago in reply to Gio

The problem is that you are comparing the charging times at different levels of the charge, so its like comparing apples with oranges. You need to make a test with different chargers charging always from the same minimal level to the same maximal level. The charging curve of the battery is not linear.

0 TeaRacer over 5 years ago in reply to Gio

That's right, charge from 5 to 100% with each adapter and then compare the charging times. A few minutes of charging at different battery levels cannot be measured.