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"What replacement battery?" (in general)
3.7V should normally the default voltage (V) of this build-in Lithium batteries. I suppose you could choose any other Lithium Battery, with the same voltage. To the best of my knowledge.
The origin battery of HX-P230A has ~500mA (=0.5A). You could also take a higher A (ampere) to prolong use-time.
I personal chose Battery “NB-6L” (3.7V, 1600mAh). The physical dimension of this battery are nearly perfect for HX-P230A.
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