1500A JumpsPower GT Jump Starter Powerbank 29600mWh 12V Phone Car Battery Charger

The cheapest way to be sure a flat battery does not end the weekend is a jump starter small enough that it actually gets carried. This one is 370 g and 168 mm long, roughly a paperback, which is the difference between living in the glovebox and living on a shelf in the shed.

750 A where it counts

JumpsPower quotes 1500 A peak and 750 A clamp power on 12 V. The peak number carries an asterisk in the supplier's specification and nothing explains what it qualifies, so the 750 A at the clamps is the figure to judge it on. The 29.6 Wh pack — 8000 mAh — is rated beyond 1000 charge cycles and holds a claimed nine to twelve months of standby charge, which matters far more than raw capacity in a device that spends its life waiting. The supplier lists it for petrol and diesel engines but states no maximum engine size.

USB-C in, 12 volts out

Note which way the USB-C port runs. On the GT it is an input rated at 10 W, so the unit recharges from the same cable as a phone with no orientation to get wrong, but devices do not charge from it. Those come off the USB-A output at up to 17.5 W, fine for a phone or a tablet at normal speed. The 12 V DC socket is the more interesting one: 96 W at 8 A drives a tyre inflator, a 12 V vacuum or a camp light straight from the pack. An integrated LED runs several flashing patterns for roadside use.

Key features

• 750 A clamp power: the delivered 12 V figure, with 1500 A quoted as peak.
• 370 g: genuinely glovebox-sized at 168.5 x 84 x 32 mm.
• 96 W 12 V outlet: runs an inflator or a camp light without the vehicle running.
• USB-C recharging: reversible plug, 10 W input, so no dedicated charger to lose.
• Modern engine systems: listed by the supplier as suiting turbo, hybrid and start-stop vehicles.

Specifications

• Battery capacity: 29600 mWh / 29.6 Wh / 8000 mAh
• Battery type: lithium-ion, 1000+ life cycles
• Standby time: up to 9-12 months
• Peak amps: 12 V / 1500 A (asterisked by the supplier without explanation)
• Clamp power: 12 V / 750 A
• USB-C: input only, 10 W max (5 V / 2 A)
• USB-A output: 17.5 W max (5 V / 3.5 A)
• DC output: 96 W max (12 V / 8 A)
• Operating temperature: -20 °C to 60 °C
• Dimensions: 168.5 x 84 x 32 mm
• Weight: 370 g

What's in the box

• 1 x JumpsPower GT
• 1 x jumper cable
• 1 x USB-A to USB-C cable
• 1 x 12 V cigarette lighter adapter
• 1 x user manual
• 1 x carry bag

Worth checking first

• This is a 12 V unit. Confirm your vehicle's system voltage and follow the connection sequence in the manual.
• No maximum engine capacity is stated by the supplier, so if you are starting a large diesel, size up rather than assume.
• Stay inside the -20 °C to 60 °C operating range and recharge it every few months.

The sensible size for a commuter car, a bike or a camper trailer toolbox.