Weight quotes vary from 121g to 159g. Not bad for 6000mAh and 2.1V output, indicators, and an led backup.
I'm hoping to do wainwrights coast 2 coast in 3 days soon, which will mean limited rest, so I think 6000 or 9000 (3000+6000) should do the trick leaving the iphone on sleep constant running of a garmin 310XT.
I have been playing with the FollowMe app since I last posted on here. Have to say it does the trick. The free app updates every 30mins, but I bought (one off £3) the standard app which, amongst a few other things, allows me to reduce the updates.
On 10min updates and with nothing else running on my iphone (apart from the basics) the phone runs down by 3%/hr in sleep mode. So a rough 33hrs on a full charge and my family/friends can see where I am on an online tracking map every 10mins. That will do me.
A 3000mAh similar to the one booktrunk recommended. I thought I'd go with this because although weight is the same, this one has a high voltage (not that it matters too much) and a strong flashlight. May come in handy, and I'll take as a backup to my headtorch (saving more weight). Also £5 cheaper than the Anker and on a good deal right now. Drawbacks - no battery power indicator, you need to make sure you don;t press the switch by accident in your bag and wear out the battery(!)
Thanks for the info! Lightweight chargers is also something I have been meaning to look into.
The Anker looks great at 85g and 3000mAh (I think my iphone charges to 1400mAh so that would give me x2 additional charges). Just a pity there is no indicator on the side of the Anker to show battery status.
I'm looking for a tracking app (iphone 4) that gives updates on current location without wasting too much battery power, and provides a web link to a map for friends/family to check your whereabouts.
I'm not bothered about any other data as I can get this from my Garmin watch. But it would be nice to have something running in the background for run/hikes over 1-2 days off-road.
Any recommendations appreciated?
I'm currently trying Glympse and Followmee. Followme has more relaxed updates (15mins would be great), but I'm not sure about it's reliability off-road. Find My Friends has been mentioned but I believe Glympse and FMF will eat up battery power(?).