Is there away to test a jump starter pack?

Maintenance/Repairs
21 
Mine seems to have lost its "viagra-effect".  It will charge-up fine, start a car if you get it right away, first attempt or so, but then won't turn the starter and has to be re-charged.  I've just replaced my jumper cables for exactly this reason, seems cheaper and easier to have decent cables, as least for my applications and usage.  Rocketman
22

Attach the jumper cables to the battery cables of your car (to maintain power to the car computers’ memories). Remove the car’s battery cables (with the jumper cables attached to the battery cable terminals) from their posts. - hellokit

If I understood you, you’re saying basically to disconnect the battery and to attach the cables of the jump start pack to the cars’ cables as though the jump start pack was the regular battery - so positive to positive, and negative to negative? So with the regular battery out of the picture you don’t have to worry about attaching the one cable (negative) as a ground? Thanks.

23

You can buy a replacement batttery for your jump box for about $30 a good one. It’s cheaper than a new jump box. The replacement batteries I’ve bought have lasted better than their originals. I noticed right off that my last new one was about 2-3 pounds heavier than the original. We’ll have to wait and see how long it lasts. I use it two or three times a week at the shop.

24 
Thanks MG . . . I did not know that!  I'll look at it this afternoon and see hwere it goes, how it is removed, and so forth.  Rocketman
25

Attach the jumper cables to the battery cables of your car (to maintain
power to the car computers’ memories). Remove the car’s battery cables
(with the jumper cables attached to the battery cable terminals)
from their posts.

If you try the above procedure, once the car starts, take extreme care that your jumper cables do not break the connection with the car’s cables - even for an instant. If they do, perhaps because they were not securely clamped, you run the risk of the alternator producing voltage spikes that could damage some of the car’s electronics.

Car alternators can and often do produce voltage spikes. It’s normal. However, the battery always absorbs them because it acts like a huge capacitor in the circuit.