Rechargeable or battery lights - ?

[Jameshow]

https://www.ebay.co.uk/itm/31342820...tixoXeJTeO&var=&widget_ver=artemis&media=COPY

I have one of these but the battery life is rubbish. Could I power it from a usb power pack with a usb to power plug?

https://www.ebay.co.uk/itm/22507800...tixoXeJTeO&var=&widget_ver=artemis&media=COPY

Then a usb to usb rear light for the rear??

Or one if these...
https://www.ebay.co.uk/itm/18532472...tixoXeJTeO&var=&widget_ver=artemis&media=COPY

Power pack under brooks saddle?!

 

[Sharky]

I've bought these batteries from, Amazon in both AA and AAA sizes:-

Perfectly OK for most devices, but I find that the diameter of these batteries, particularly the AA ones, are minutely bigger and in some devices, very difficult to squeeze them in.