I use the MS Surface "Adrawpen" from Amazon on my Sage. Almost identical design to Kobo pen that came with Elipsa. No pairing required. Just works on either and the AAAA battery life is enormous. Still not needed to recharge. Very cheap. Works perfectly.
I'd not use rechargeable versions of anything with such a long battery life. I have spare cells from a dismembered €2 9V alkaline pack, though some don't use those cells.
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