AstroAI B8 Car Jump Starter, 12V, 7.0L Petrol/5.5L Diesel

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Product guide

AstroAI B8 Car Jump Starter, 12V, 7.0L Petrol/5.5L Diesel

The AstroAI B8 car jump starter is a compact 12V booster listed for engines up to 7.0L petrol or 5.5L diesel. It also claims power-bank and three-mode LED-light functions, while customer feedback is positive overall but mixed on charge retention.

At a glance

The listing claims support for 7.0L petrol and 5.5L diesel engines, including motorcycles, cars and SUVs.
Three LED modes are listed: steady light, SOS and strobe.
The manufacturer describes 10 built-in protections, including reverse polarity, overcurrent, overcharge and short-circuit protection.
The jump starter is also described as a portable power bank for devices.

Price

£29.95Save 25%

Reference price: ~~£39.99~~

Price checked: 13 Nov 2026

View offer

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Pros and cons

Pros

Combines jump-starting, device charging and an emergency light in one unit.
Smart clamp indicators are described as showing correct or reversed connections.
The claimed 2-year manufacturer's warranty is stated in the listing.

Technical specifications

11 specifications

Identity
Brand	AstroAI
Model	B8

Power and battery
Voltage	12 Volts
Battery type	Lithium Polymer
Battery capacity	8000 Milliamp Hours
Amperage	2000 Amps

Compatibility
Vehicle service type	Automotive
Automotive fit	Universal Fit
Engine compatibility stated in title	7.0L Petrol/5.5L Diesel

Dimensions and installation
Dimensions listed	8.3D x 16W x 2.8H centimetres
Weight listed	650 Grams

What to know before buying

Listing details to confirm

The listed 650 Grams weight conflicts with the feature text's claim of 329g. Confirm the weight for the selected version before buying. The maker advises stopping if a start attempt lasts over 5 seconds, removing the leads, avoiding leaving clamps connected, charging at 0–45°C with a 5V/2A charger, recharging at 1–2 bars and topping up every 3 months. It also warns against powering accessories through EC5 adapters because this may drain the battery to 0V and make it unchargeable.

What’s in the box

Included

AstroAI B8 car battery jump starter
Gift box
Smart jumper leads
Storage bag
Use manual
Warranty card
USB cable

Who is it for?

A good fit for

Drivers who want a portable emergency jump starter with smart leads and an LED signal light.
Buyers whose vehicle engine falls within the stated 7.0L petrol or 5.5L diesel limits and who want an additional power-bank function.

Less suited to

Buyers who need a confirmed lighter-than-329g unit, since the listing gives conflicting weight figures.
Drivers whose engine exceeds the stated petrol or diesel limits.

AstroAI B8 Car Jump Starter, 12V, 7.0L Petrol/5.5L Diesel · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 2,371 ratings

5 stars81%81%
4 stars10%10%
3 stars2%2%
2 stars1%1%
1 star6%6%

Customer feedback highlights reports of reliable starts, ease of use and convenient size for keeping in a car. Battery life is mixed: some feedback says charge remains high after use, while other reports say the unit does not hold a charge. That uncertainty matters for an emergency device, so periodic charging is especially relevant alongside the maker's top-up guidance.

Positive themes

Customers report reliable starting and appreciate the compact size, portability and ease of use.

Mixed feedback

Battery charge retention receives mixed feedback, with reports ranging from retaining charge after use to not holding a charge.

Frequently asked questions

Which engine sizes does the AstroAI B8 claim to support?

The title specifies 7.0L petrol and 5.5L diesel. Check these limits against your vehicle before purchase.

Can it charge devices as well as jump-start a vehicle?

The listing describes it as a portable power bank and includes a USB cable, but does not specify charging capacity or output.

What is its listed weight?

The details give 650 Grams, while feature text claims 329g. The discrepancy is unconfirmed, so check the selected listing if weight matters.

What charging and storage guidance is provided?

The manufacturer recommends a 5V/2A charger, charging between 0–45°C, recharging when the display reaches 1–2 bars and topping up every 3 months. It warns not to leave the clamps connected or use EC5 adapters to power accessories.