Anyone used a mini battery jumper thingy?

[b5blue]

  You know the things about the size of a paperback book? Powers up phones and can jump your car also? Wonder how long the thing can hold a charge and how long the device has for a service life?

[johnnycharger]

I got a weego one for Father's day. It is great. I don't know how long the charge lasts because I don't let it run out. It is awesome for camping as a backup for cell phones as well.

[b5blue]

Will it start your Charger?  A friend at work bought something like that a year ago. He said his is dead now.

[johnnycharger]

I haven't tried it on the charger yet.

[b5blue]

I'm thinking my friend at work isn't the "type" to take perfect care of his devise. He's a bit kooky.