DSLR Battery solution wanted..

I am visiting Kenya, Africa in October for a 2 week safari vacation, and
very much looking forward to taking my Canon 400D along for the ride :-)

However, i have a challenge...my accomodation in Kenya will be a tent camp
(at varying locations) and as such, there isn't any access to electrical
power points etc ( or showers and toilets for that matter!)

So, I now need a solution as I realise my 2 batteries for the 400d are NOT
going to be enough..I am hoping to take around 200-ish jpg photos a day for
9 days, and even storage is a problem, as I have an acrchos 500 media player
I was going to use to back up my photos onto, but using it would be a HUGE
drain on power for both the camera and the media player.

I have friends kindly willing to loan me CF cards, so storage isn't a HUGE
problem, but what should i do about the battery problem?

I am willing to buy a further 2 MAYBE 3 more canon batteries, but these
things are not cheap at around £45 each.

All help appreciated



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