Review on Genie ReliaVolt 400A Peak 12000MAh Car Jump Starter And Battery Booster, Phone Charger Portable Power Pack - Safely Jumpstart Your Car & Charge Your Phone Easily by Sean Xayamonty

It holds the charging for a long time. I have an old car in my garage which needs to start with a jump starter if I haven't used it for a few weeks. I used this jump starter on that and it works great. Before this, I was using the 10,000mAh jump starter which I bought from Costco that was also working fine. It is very easy to use and it is a compact size easy to carry this in my car. It is durable and has great value for money.