I had to leave my Disco sport at Heathrow for 3.5 weeks and given that the message "battery low, please start engine or car will power down in a few minutes" kept coming up if I had the radio on but no engine running I decided to get one of these. At the time it was only £25

https://www.amazon.co.uk/BAPHIYA-Starter-P...B0CRB3X4DY

As it happened the car started ok but it was a useful belt and braces and who fancies sitting in a Heathrow car park for a couple of hours waiting for the RAC to find you?
Funny thing though my wife left her car door ajar overnight shortly after and ran her battery down and it worked fine. 3 x FL1 2 manual + 1 auto
5 x FL2 4 manual + 1 auto
Now Discovery Sport P250 MHEV SE

I was going to say had you actually tried it out under normal conditions but your wife's occasion says yes. I was sceptical getting another cheap one from Amazon as bought one a fe w years ago looked okay but was useless when it came to actual use.!

I suppose that the thing about these devices is that they don’t actually start the car but mainly give the car battery a quick boost charge and between them start the car. The cables that come with it don’t look capable of carrying 600+ amps without melting but it would be interesting to try it out on an old car with no fancy electronics and without a battery connected 3 x FL1 2 manual + 1 auto
5 x FL2 4 manual + 1 auto
Now Discovery Sport P250 MHEV SE

I’ve seen YouTube videos of them starting trucks without there even being a battery on it the cables that come with the Noco packs are well up to the job.

And the breakdown guy who used his Noco saturday said he had started lorries and buses with nearly totally flat batteries. Mine was howing 4v when he connected it up and she started straight away first time.

Voltage drop =

Cable length total of + & -
x Current in amps
x 0.0164
divided by cross sectional area in mm².

So for arguments sake I believe you are supposed to connect the booster for say 10 minutes or until it says its ready.

Let's say the Freelander diesel needs 300 amps to start (my 2.0L petrol needs 238amps according to Kyoritsu 2046R clamp meter)

I would say at worst your are drawing is 150 amps from the booster, since you have charged up the battery a bit. You are using the battery for amps & the booster is really there to keep the voltage up.

Booster clips length plus cable, lets say 0.6m (+ & -) x 150 x 0.0164 / 8.35mm² (8awg*) = 0.177 voltage drop.

* 8awg is guess from photo of product. I wouldn't worry too much, but if you are someone like me I would rewire it. Not point unnecessarily wasting wire resistance. A short piece of 4awg is hardly going to break the bank (21.15mm²), 40% of the resistance, or 1awg at 42.39mm² at 20% of the resistance. Better stillI would have a plug adaptor for my welding cable jumper leads... no fluffing about.#

I would still get a large capacity booster as the stated amps (let's 1500 amps or whatever) will effectively be a short circuit figure. So a voltage so low it will be useless.

2 x 26 AH gel batteries under the seat.

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My understanding is these 12v packs raise the 'electronics voltage' up to 12v which then allows the engine systems to crank and potentially start the engine from the battery.

Bogart wrote:

Have odered a new battery as well as one on car is not charging correctly. Charger say fully charged when voltage is 14.8 v. Disconnect charger voltage drops to 12.7v then shortly after continues to fall so mught have buggared it Saturday.

Procrastination or what lol. Tried it and started car 3 times. First time battery was 6.5 volts. So happy with the unit pop it in the glovebox and forget it.

Which NOCO would people recommend for someone like me that just wants to keep one in the car for emergency situations and to use when camping to top up electrical devices? I'm currently eyeing up the NOCO GB50?

https://www.halfords.com/motoring/battery-...16406.html https://www.youtube.com/@scottandalana4x4

I had a NOCO GB20, used many times on my MX5 which had a failing battery. It kept its charge over months stored under the seat. Maybe the next larger for a diesel, but well worth it for peace of mind.

I and SYFL2 have the GBX45. The X models are the latest itteration of the boost series.

Dean1234 wrote:

Which NOCO would people recommend for someone like me that just wants to keep one in the car for emergency situations and to use when camping to top up electrical devices? I'm currently eyeing up the NOCO GB50?

https://www.halfords.com/motoring/battery-...16406.html

I ended up buying the NOCO Boost XL GB50 thanks to your recommendations. We even put it to the test seeing as Alana's Mini Cooper S R53 was as flat as a pancake. In case anyone is interested in a NOCO boost pack, we put together a little video of us trying it out.

 https://www.youtube.com/@scottandalana4x4