Wil this start a completely flat battery 1.8L car? I read on another product that these machines can't do that - only boost.

Why do people who don't know bother to answer someone's question? It's pointless. Leave the charger connected to your flat battery for a while to trickle charge then try it. You won't start it from flat.

Up to what size engine will it start?

started a 2.4 diesel Transit after leaving connected to give battery chance to take a charge

Can this unit be left on charge until needed using a modern optimate charger which monitors battery condition to prevent over charging.

The manufactures recommend charging the unit to it full charge and then recharging at 2 monthly intervals. It will start most cars even if not fully charged. I have had mine only for a short time, I managed to start my neighbours car with ease using this unit. I don't think they are designed to be continually charged, but if you have some sort of charger that monitor the level of charge, I would wait till Monday then ring Sealey and ask the support department, they will tell you for sure. Hope this helps

Seller?: my boat engine, a Yanmar 2GM deisel manual says needs a batt capacity of min 70 amp hours (my boat batt is 110). will this be good backup?

This battery box is essentially used to start engines when the engine starter battery is flat (discharged). It would not bne any good as a substitute battery.It is a small battery which is capable of delivering a big 'wallop' but then needs recharging. If you want to talk about the needs of boats in particular, give me an email to axemann@hotmail.com. I have owned boats for nearly thirty years.

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Rs1312Hv Roadstart Emergency Power Pack 12V 900 Peak Amps Hi-Vis Green

Product ID: 49552464

Details

Battery cell composition
Lead-Acid AGM
Brand
Sealey
Item weight
6.38 Kilograms
Vehicle service type
automotive
Voltage
12 Volts

⚡900 Peak Amps jump power

🔋AGM Lead-Acid battery tech

🔦Built-in LED work light

R6908

Duties & taxes included

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Description

⚡ Jumpstart your peace of mind with power and safety in one sleek pack!

HI VIS DURABLE DESIGN - Robust composite case with rubber protection and carry handle for rugged, on-the-go reliability.
SMART SAFETY FEATURES - Audible polarity warnings & spark-free positive clamp connection keep you safe every time.
MULTI DEVICE CHARGING HUB - Dual 12V sockets plus USB outlet (5V/1A) power your gadgets and accessories anywhere.
POWERFUL 900 A PEAK OUTPUT - Instantly jump-starts engines up to 8L petrol & 6L diesel—never get stranded again.
NIGHT READY LED WORK LIGHT - Integrated bright LED illuminates your workspace—perfect for emergency roadside fixes after dark.

The Sealey RS1312HV Roadstart Emergency Power Pack delivers a robust 900 peak amps to jump-start a wide range of vehicles, from 4-cylinder engines up to 8L petrol and 6L diesel. Housed in a hi-vis green composite case with rubber protection, it features smart safety tech including audible polarity warnings and a spark-free positive clamp. With dual 12V power sockets and a USB outlet, plus an integrated LED work light, this compact, briefcase-sized unit is your ultimate roadside companion for power and convenience.

Specifications

ASIN	B06Y657D1S
Amperage	900 Amps
Best Sellers Rank	13,396 in Automotive ( See Top 100 in Automotive ) 102 in Car Battery Jump Starters
Brand Name	Sealey
Compatible with Vehicle Type	automotive
Customer Reviews	4.0 4.0 out of 5 stars (942)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	05054511180435
Included Components	RoadStart® Emergency Jump Starter 12V 900 Peak Amps Hi-Vis G
Item Type Name	RoadStart® Emergency Jump Starter 12V 900 Peak Amps Hi-Vis G
Item Weight	6.38 Kilograms
Manufacturer	Sealey
Manufacturer Part Number	Rs1312Hv
Model Number	RS1312HV
Number of Items	1
Peak Output Current	900 Amps
Unit Count	1.0 count
Voltage	12 Volts
battery-cell-composition	Lead-Acid, AGM

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R6908

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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