Stanley J309 300 Amp Jump Starter

• 600 Peak Battery Amps / 300 Amp Instant Starting Power
• 270° Pivoting high powered LED emergency light
• Built-in 120V AC charger, recharges unit with standard household extension cord
• Tough durable housing with heavy duty metal clamps
• Reverse connection warning provides audible and visual alarm
• Desulfation Technology
• Etl Listed Product
• 300 Amp Instant Starting Power
• 12V Usb Light
• Item is nonreturnable

Awesome! Plenty of jump start power. Purchased 1 from Amazon & another from my local hardware store(same model). Used 4 times in the last few days on our fleet vehicles. Cars/trucks/vans...no problems. Charging is easy on this model, just plug it in with an ordinary household AC extension cord or use the DC adapter supplied. Also, this unit has an on/off switch. My old one didn't so the terminals were 'HOT' all the time. Life saver device, well worth the bucks!

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I bought this jumper to jump my motorcycle. The battery goes dead every winter and I am not in an area where I would be able to keep the battery charged over the winter (I am forced to park the thing out on the street). Anyway, this jumper works great I plugged it in, let it charge for a day (although I don't think it requires a full day to charge) and jumped my bike right up the battery on my bike was completely dead prior to the jump. Very easy, no problems.

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Nice features, well constructed. I plug it in to charge it up once a month. (more often than suggested) I let it charge for two full days when I charge it, indicators read full charge.

I needed to use it today because my car battery finally died (6 years old). I plugged the Stanley in to top up the charge, let it top up for two hours. Indicator showed full charge. Tried to start the car. Nothing. I could see sparks when I attached the battery, so I know there was juice, but just not enough to turn over the 6 cylinder engine.

The Stanley unit has a battery level indicator, before the attempt it read full charge. After, the indicator was in the middle. Back inside, I hook it up to charge it again, it reads low.

GM road side assistance showed up with a much beefier version of a portable battery source, and the car started up immediately.

This unit is one year old, so I am guessing that the internal battery just does not last, or can not actually supply the starting current that it claims.

Just a big beautiful paper weight. Go for a much beefier unit, or perhaps one with lithium ion batteries. Better yet, just subscribe to a road side assistance plan.

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My battery wouldn't hold a charge and I used this every day for 4 months to start my car and it exceeded my expectations. I never expected it to last that long, but with charging once every 3 weeks or so it worked fine. Small, portable, and much easier than jumper cables. Highly recommended.

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I use it to start my lawn mower and cars if necessary. So far, it has been working well. It is much better off for me to have this battery pack than buying a dedicated battery for my lawn mower. A great product!