If you own an Apple Watch, you might want to check out this Kickstarter campaign. The Maco Go is a small Apple Watch charger that is compatible with Gen 1 and Series 1 to 5 Apple Watch. (And it most likely will be compatible with future Apple Watch until Apple changes its charging mechanism.)
Just plug the Maco Go into a laptop, smartphone, iPad Pro, or powerbank to charge your Apple Watch. Simple. No long messy cables. Convenient to carry around.
The Maco Go is currently on Kickstarter at AU$22. (Approx S$19) The expected delivery date is July – August 2020. But the usual risk and challenges for Kickstarter campaign projects applies. So only back this project if you understand the risk of backing a Kickstarter project.