Quote: Robbo "just got an iphone 3gs and absolutley love it, only let down being the battery life but its just enough to get by with!
i've been looking online at portable chargers that fit around the phone and will charge if youre short on battery power, has anyone any experience with anything like this and know if they are any use at all?'"
Depends on what kind you are after, the case/chargers in one add a lot of bulk such as the mophie jucie pack or case mate fuel, I actually had a cheaper one from internet about £9.99 that plugged in the bottom only however this only charged it to about 70% from 10% then it ran out. Stay clear of Griffin products that also double up as a car charger they are cr@p.
I used mine quite a lot and easily killed the battery with everything running twice a day.
Check out reviews of things like Richard solo 1200 and 1800 these are on youtube also expensive but it depending on what kinda battery back up your after; obviously working in an office is different to being out and about.
iLounge also gave a great review to a 'just gum pro' mobile charger so check that out too. I have that and use it for my Blackberry.
Up to you but there are a few suggestions, the larger then mAh then the more power the battery back up holds. The just gum pro is a massive 4400mAh I think.
They will not harm your iPhone and do a very good job, the decision is which one to choose.
Tony.