My portable jump starter is this one from Cen-tech:


I've had it for about 12 months and used it a few times shortly after I got it. However, I haven't needed it in about 7 months. And unfortunately, it was sitting in my garage in a state of low-charge for most of that time.

Well, my car battery died the other day, so I wanted to get this charger back in action. It was obviously out of charge, but when I plugged it in to charge, nothing happened. No lights come on, nothing happens when I press the "battery test" button, nothing. I charged it overnight and nothing seems to be happening at all.

It's barely been touched, so I'm guessing this is because I didn't do proper maintenance on it.

So I guess what I'm asking is whether the jumper is just ruined. Is there any way to tell if it's still viable? Or was it in a discharged state for so long that there's no hope for it?


The link says it's a lead acid battery chemistry being used in that device. That type of chemistry does very poorly when sitting around idle. Periodic charges after each use and on a schedule thereafter will enable it to remain as healthy as possible, but even then, there's a life span of three to five years.

You should be able to purchase a replacement 17 amp-hour battery and replace it, to restore the device to practical use. Consider also to invest in what is called a battery tender, which maintains lead acid batteries without overcharging them.

A quick check online shows prices for a 17 ah battery sealed lead acid to be in the US$25-30 and up range. Battery tenders run about that price, but even if you replace the device completely, you'd want a tender to keep it healthy as long as possible, otherwise, you'll be throwing it away later.

|improve this answer|||||

Yes, it is ruined. Lead acid batteries do self-discharge and get ruined if stored for long periods of time at empty state of charge. Not only that but they are heavy for the amount of capacity they have.

Next time, buy a lithium ion jump start battery. It will have a lower rate of self discharge and doesn't get damaged if left empty. It costs a bit more $$$, but it's worth it.

|improve this answer|||||

I put mine in back of my car and never used it for 6 months i charged it but it didnt have enough juice to jump a dead battery. I pulled the back off charged the lead battery with my battery charger for about 8hrs. Put battery back in the pack and viola. Works great and ive charged it up the normal way and still holding up.

|improve this answer|||||

I have the same issue on one of them. Bought it charged it and used it twice, now i did charged it all night till full green light then used it then leave it for one or 2 weeks then try again for cell charging and goes back to yellow 2 bar low batt again? What is the issue????

|improve this answer|||||
New contributor
Carlos a is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.
  • Lol this batt chargers really suck – Carlos a 2 days ago

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.