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In order to extend the lifetime of Japanese iPaq 3630, here are some of the things that may be done:

1. Replace the battery
This site sells the battery and give installation guide:

http://www.ipaqbattery.com/ipaqbatteryinstructions.html

Compatible batteries (e.g., Li-Polymer, 3.7 Volts 1600mAh) are also seen on Yahoo actions for around 3,000yen.

2. Add external storage and WiFi
Sandisk Connect Plus provides both 128MB storage and WiFi on a CF enclosure. Yahoo auctions has it for around 4000yen, while stores sell it for around 7000yen.

3. Overclock
This software claims to overclock the iPaq on the fly

http://www.jimmysoftware.com/Software/Overclock/default.asp