Replacement for Sony PRS 505

I am considering replacing my 505 which just had it's 8th birthday! I still really like it but the battery is rapidly declining.

What are good contenders to replace it?

Must have: e-ink, epub, good battery life

Desirable: Sd card slot

Not needed: Wifi, touchscreen, water resistance, backlight

Any suggestions?

(Buying location UK or Germany)