So here I come - 10+ years later & have the 5" reader here as well as the Nokia BL-5C & a couple of other good, orphaned batteries of similar sizes & ratings.
The BL-5C can fit although it is a bit fatter, as is the LG battery I tried.
For a ~10 year old device from a company & principal that are out of the picture permanently, there is little to be lost in trying whatever may work if/when the existing battery quits.
I have re-purposed Li-Ion batteries before to good effect, and so long as they have the correct terminals, it is no big deal to very quickly & carefully solder on the leads correctly & safely.
As to the battery door:
It can either bow a wee bit, or be replaced with the universal battery cover - duct tape !!
Either way, at some point I'll be the crash test dummy for this situation all these years later.
I've always had the 6" model & spare batteries are a non-issue for that one as we had Nokia phones that used the BL-5C pack, which got retired when 2G went offline - so I have several spare battery packs on hand as well as the external charger for them.
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