This is not the only one on the market. They are getting quite popular and 
prices vary.
A quick Google search found these articles (reviews): 
http://www.carbatterychargerscentral.com/car-starter-top-7-compact-battery-jump-starters/
 and 
http://www.autodeets.com/top-10-what-is-the-best-lithium-jump-starter-on-the-market/

mPower is listed there, but it is not #1. I found PowerAll quite available 
around here. I guess it all depends on the local market. Your prices (and 
mileage) will vary.

Btw. before these little portable batteries showed up on the market, I used an 
older portable car jump starter (with am AGM 12 Ah battery) as the only source 
of power on my previous boat (C&C 24). The outboard did not have the electric 
starter, so its charging circuits were not even close to what one would need 
(If I remember correctly it showed as 6 V!). The jump starter had a car 
accessory socket, which I used for connecting it to the boat (the boat acted 
like a one big accessory). I used it only for the VHF radio and the navigation 
lights, so there was not much current draw. Every so often I would take it home 
to recharge. It did work.

Marek

From: Chuck S via CnC-List 
Sent: Tuesday, December 01, 2015 6:57 PM
To: CNC boat owners, cnc-list 
Cc: Chuck S 
Subject: Re: Stus-List Jumper Batteries

That's amazingly small.  Think I'll get one.


C



--------------------------------------------------------------------------------

From: "Indigo via CnC-List" <cnc-list@cnc-list.com>
To: cnc-list@cnc-list.com
Cc: "Indigo" <ind...@thethomsons.us>
Sent: Tuesday, December 1, 2015 2:40:39 PM
Subject: Stus-List Jumper Batteries


I bought a mPower Jump last winter to replace an old clunky starter pack to 
keep on board Indigo.  Not 100% confident that it would start the diesel 3GMF, 
I charged up the unit at home - used it twice to start my Honda Accord, and 
then without recharging it, used it in May to start the boat with no other 
batteries connected - worked just great on the diesel that had not been run 
since laying up in the winter. 

Specs from their website below!



  The mPower Jump. Always With You, Always Ready, Always Easy to Use. 

    a.. Jump starts all 12V cars including 8 cylinder vehicles 
    b.. Fits in a glove box 
    c.. Automatic On Technology 
    d.. Multiple safety protection 
    e.. High capacity battery technology 
    f.. 600A peak current
  Technical Specifications: 

    a.. Input: 12V 1A 
    b.. Output: 12V 
    c.. Jump start Start Current: 300A 
    d.. Peak Current: 600A 
    e.. Size: 7.09 x 2.76 x 1.38 
    f.. Weight: 1.52 lbs. 
    g.. Operating Temperature: -20° C-60° C/-4° F-140° F 
    h.. Battery Capacity: 13000mAh 
    i.. Full Charging Time: Approx 4h

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