Pale Rider
Legendary Member
That's not chunky, this is chunky ....
View attachment 339475
(AA battery for scale).
Though to be fair this has 5 x the capacity of yours and it 4 years old.
Edit 2: Yours has a capacity of 2200mAh. You can compare that to the capacity of your garmin battery to see how many times it can recharge it.
For a guide, it can probably recharge an iPhone 7 completely from flat, but definitely not an iPhone 7 plus.
One more edit: The AA battery in this image is rated 2300mAh, so that has slightly more charge than the USB pack.
I see mine has gone up in price.
Mind, we've had decimalisation, colour telly and Brexit since I ordered it.