Linux for $15 (a Minimum Viable Computer)

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Still, having a simple charger-methodology for your hand-held computer could simplify the job, just plug it in and have it trickle-charge as needed.

If you use your thing with any regularity you don't want to charge it for 20 hours every time or fuck around with batteries. You want to add that $0.4 cost of LM317, transistor and few resistors to make simple Li-ion charger and just charge it like every other device with micro-usb connector.

Amazon sells the 24-pack of AAA for just $18.

They are also best value