Sony a6000 mirrorless camera battery is not weak you just need to learn how to use this little battery np-fw50 in more efficiently.
Buy cheap reliable products:
https://pixelvoiz.com/sony-a6000-dummy-battery
High capacity third party battery and charger :
https://pixelvoiz.com/sony-a6000-high-capacity-battery
Cool hot shoe cover : https://s.click.aliexpress.com/e/_ALrG8n
Small shutter release remote controller : https://s.click.aliexpress.com/e/_ADFD0T