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I don't know if this will be of any help to you, (me not knowing a lot about the technical end of most of the gadgets I use) but here goes...........
Firstly, I would advise one of those mechanically driven (you wind it by hand) battery chargers (the principle is like the wind up radios which a greatBritish inventor produced).
So now, you need not worry about battery capacity, however if it were me I'd also ensure I had an in car charger so no need to worry about the electricity supply and conversion adapters etc. African electricity supply (and I have some experience of them),can be prone to significant surges and if you don't have a surge protector you will no longer need to worry about batteries because your PDA will have blown up!!
Now onto the PDA, I very rarely see the one I use in any reviews or gadget programs, it is the T-Mobile MDA compact.
I am very pleased with mine and I use it for the following:
Mobile phone:calls (it will work abroad)
Camera: (it has a fair quality camera)
Excel: I have a number of differing excel uses
Word: used to compile letters and use the bluetooth or Infra-red function to print to another's printer or I can download to a pc whenever I'm able to use an internet cafe.(you can use this to download anything not needed on journey to constantly minimise the amount of storage you need). You will be srprised where you will find an internet cafe!! just ask!!
Powerpoint: Used to make presentations to customers via a projector or via any computer that's made available to you.
Sat Nav: My MDA is loaded with 'CoPilot'and this can be left on the sandisk/transflash memory card to save memory space. the card can add to your capacity with no limit
Contacts:over 1000 contacts on call at a moments notice with all of the background you might need including home/work address and all of the different numbers there are for instance: work, home, fax, mobile and direct line.
Synchronisation: with both desktop and laptop computers
Photos and short videos: These are functions which again can be loaded directly to a memory disc thus ensuring that you don't overload your PDA with stuff that can live on a disc until you need it.
Voice Reording: I use this when I'm in the car to record something which just popped into my head.
Email: I can review my emails at my web based email address or if memory is no problem then I can have emails pushed to my MDA.
Input: You can input via an on screen qwerty board or (as I do) a letter recogniser, in other words you write on the screen and it records your writing in print as though you had typed it.
All I am saying is give it a look, you may just like it........... Let me know how you get on and send me the odd email from afar.I hope this is helpful.