SU-8W with rechargeable batteries?

I plan to buy and use N800 for taking notes on classes, meetings etc. For this purpose I need a keyboard but unfortunately as far as I can tell (according to the keyboard manual) the SU-8W keyboard can only use LR03 batteries which are non-rechargeable.
More than financially (which also matters), with a battery life of ~50hours, I would need to get new batteries quite often which is ekologically problematic.
Does anyone know whether there are any rechargeable alternatives to the LR03 batteries or am I forced to buy some other vendor's BT keyboard for writing?
Any insights deeply appreciated.
Niko Kotiniemi

I'm not sure what you're using as a tester. Those cheap ones that just say "good" or "bad" aren't specific enough. A battery that no longer has enough energy for a full-power pop from a flash could potentially still power a TV remote for quite some time. It depends on what the manufacturers of the tester use as their limit for "good".
If you're using a volt meter, I usually charge my Eneloops once they fall below 1.2V. I don't regularly use a voltmeter to check this, but my charger tells me what my voltage is when I recharge. If I use the batteries until the recycle time starts getting long they're usually around 1.2 V. If I use them until it won't work at all anymore it's usually closer to 1.1 V.

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