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GeneralRe: Car Battery Charger/Jump Starter Pin
Darren_vms28-Aug-15 5:59
Darren_vms28-Aug-15 5:59 
GeneralRe: Car Battery Charger/Jump Starter Pin
Bassam Abdul-Baki28-Aug-15 6:22
professionalBassam Abdul-Baki28-Aug-15 6:22 
GeneralRe: Car Battery Charger/Jump Starter Pin
Pualee28-Aug-15 7:35
Pualee28-Aug-15 7:35 
GeneralRe: Car Battery Charger/Jump Starter Pin
R. Giskard Reventlov28-Aug-15 6:23
R. Giskard Reventlov28-Aug-15 6:23 
GeneralRe: Car Battery Charger/Jump Starter Pin
chriselst28-Aug-15 7:19
professionalchriselst28-Aug-15 7:19 
GeneralRe: Car Battery Charger/Jump Starter Pin
PIEBALDconsult28-Aug-15 6:46
mvePIEBALDconsult28-Aug-15 6:46 
GeneralRe: Car Battery Charger/Jump Starter Pin
Pualee28-Aug-15 7:28
Pualee28-Aug-15 7:28 
GeneralRe: Car Battery Charger/Jump Starter Pin
enhzflep28-Aug-15 8:47
enhzflep28-Aug-15 8:47 
I've always thought that some of the newer LiPo emergency jump-start battery solutions were pretty damn neat. You can pick them up for a wide range of prices. Anything from about $20 to about $200. Some of them double as a usb phone-charger too.

Here's the cheapest and nastiest of the options - ~$20 + the price of a charger for it ($23 US for a Turnigy Accucel 6 - which can also charge a fist-full of different cell chemistries)
Jump starting a car with a $20 LIPO battery[^]
http://www.hobbyking.com/hobbyking/store/__7028__Turnigy_Accucel_6_50W_6A_Balancer_Charger_w_Accessories.html[^] - I power mine with an old pc PSU
The video uses a 4s pack, though you can do it (and it's safer for the car's electronics) to use a 3s pack

Here's a couple of commercial LiPo solutions, complete with led torches and usb outputs:
http://www.cnet.com/au/news/pocket-sized-jump-starters/[^]

To do it on the cheap, you just need to be able to supply about 1,200 watts. You can do this with a 3s LiPo with a discharge rating of 30C and a capacity of 4Ah. This is entirely safe for the car's electronics, since it's got a maximum pack voltage of 12.6v
Here's one for US $26, which can actually give you about 1,600 watts for 10 seconds: Turnigy 4000mAh 3S 30C Lipo Pack[^] - For a grand total of about USD $49 + an old PSU, when you use the Accucel 6

But like others have said, if the battery died after just 4 days without use, you've got other problems that need attention first. Even if the alternator still charges the battery, the diodes can be shot which can cause the battery to drain. If I were you, I'd charge the battery first, take it out for several (4) days and ensure that it still died. If so, you can be certain the battery is expired and it's not the alternator that's draining it. If this didn't fail, I'd look into repairing/replacing the alternator.

I'd expect that plonking down the hundred bucks and buying a new car battery would be the best solution.
"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon


modified 28-Aug-15 15:21pm.

GeneralRe: Car Battery Charger/Jump Starter Pin
Bassam Abdul-Baki28-Aug-15 13:33
professionalBassam Abdul-Baki28-Aug-15 13:33 
GeneralRe: Car Battery Charger/Jump Starter Pin
ricmil4228-Aug-15 8:53
ricmil4228-Aug-15 8:53 
GeneralRe: Car Battery Charger/Jump Starter Pin
Sander Rossel28-Aug-15 10:50
professionalSander Rossel28-Aug-15 10:50 
QuestionTape-to-DVD Pin
David Crow28-Aug-15 5:28
David Crow28-Aug-15 5:28 
AnswerRe: Tape-to-DVD Pin
Bassam Abdul-Baki28-Aug-15 5:42
professionalBassam Abdul-Baki28-Aug-15 5:42 
QuestionRe: Tape-to-DVD Pin
David Crow28-Aug-15 5:45
David Crow28-Aug-15 5:45 
AnswerRe: Tape-to-DVD Pin
Bassam Abdul-Baki28-Aug-15 6:14
professionalBassam Abdul-Baki28-Aug-15 6:14 
GeneralRe: Tape-to-DVD Pin
908236528-Aug-15 9:28
908236528-Aug-15 9:28 
GeneralRe: Tape-to-DVD Pin
PIEBALDconsult28-Aug-15 6:08
mvePIEBALDconsult28-Aug-15 6:08 
GeneralRe: Tape-to-DVD Pin
Bassam Abdul-Baki28-Aug-15 6:14
professionalBassam Abdul-Baki28-Aug-15 6:14 
GeneralRe: Tape-to-DVD Pin
stoneyowl228-Aug-15 6:44
stoneyowl228-Aug-15 6:44 
GeneralRe: Tape-to-DVD Pin
PIEBALDconsult28-Aug-15 6:07
mvePIEBALDconsult28-Aug-15 6:07 
GeneralAPOD PinPopular
R. Giskard Reventlov28-Aug-15 4:56
R. Giskard Reventlov28-Aug-15 4:56 
JokeRe: APOD Pin
Afzaal Ahmad Zeeshan28-Aug-15 5:19
professionalAfzaal Ahmad Zeeshan28-Aug-15 5:19 
GeneralFeeling, grown up Pin
Afzaal Ahmad Zeeshan28-Aug-15 4:54
professionalAfzaal Ahmad Zeeshan28-Aug-15 4:54 
GeneralRe: Feeling, grown up Pin
Rage28-Aug-15 5:02
professionalRage28-Aug-15 5:02 
GeneralRe: Feeling, grown up Pin
Afzaal Ahmad Zeeshan28-Aug-15 5:12
professionalAfzaal Ahmad Zeeshan28-Aug-15 5:12 

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