Hi Harland
I've just weighed mine ....
Satmap, mapcard, case and rechargeable battery (as used on walks) ... 338gm
charger ........ 141 gm
Remember you would need to be able to recharge the lithium battery every couple of days or so. Disposables are useless ... I got 5 hours from a new set of 3 Duracell with the screen on low (at a cost of £3.19).
I used the Satmap for my recent c2c, using the rechargable battery, on average I was getting approx 15 hours + out of one full charge, when I didn't have charging facilities I used the supplied battery holder (satmap plus) with Energiser Lithium batteries they are more expensive than the Duracell but last a lot longer, shop around and you will get them at a good price I paid £5.49 for a pack of six and will never use any other type of battery again
www.eurobatteries.com Harland...... the Satmap is expensive but this is a perfect example of "you get what you pay for", I will never go into the hills again without it (plus map & compass just incase things go wrong)purchasing the Satmap Plus gives you acess to the satmap route planning / sharing software as wellas the power pack, hence the extra cost but well worth it.
Be a good boy and you never know, Santa may come early for you.....buy and enjoy.
TLW