Given the traditional starter death click that will often effect the Aero when left up for winter I thought I would put in a thread around jump start units.
Usual things to look for.
1. When you twist the key the lights come on but may be dim
2. Often the mileage display will be dim or shading
3. When you press start it all dims and you get nothing but a click from the starter and no turn.
The good news is that the click means the relay and starter are trying but in general the current is not enough to turn the engine.
One of the things to check is the other end of the black -ve cable where it attaches to the body in case this is corroded.
Usual rules around the battery connections apply, clean grease etc. When I did the swap I used the permanent battery connectors that came with the c-tek which allow you to clip on/off the cable easily.
Last year I put a new Yasa 075 battery in the Coupe. The battery that came with it was a Banner 075 however it appears that most 075 models will work.
http://batteryfactory.co.uk/collections/car-batteries/type-075 (other suppliers exist, just used it for a link)
There appear to be two primary types of battery on the market, standard and AGM (absorbent glass matt) which has several benefits but I have not found it in 075 size. The AGM is for modern stop/start cars and can be fitted inside the bodyshell as it is meant to avoid giving off fumes etc. In general AGM also give more power to turn the engine. I will not mention the alternatives like Li-Ion or solid state as I have no experience of them.
I had the Coupe on a trickle charger all over winter and when I went to start it got the usual click of death.
So first attempt was full power battery charger - 10amp for 4 hours - nothing.
I ordered a Noco GBX55 from Amazon. It is slightly over-powered for the engine but it's better over than under and Amazon had an offer on that one.
https://www.amazon.co.uk/gp/product/B08WZKRHZZ/The GB and GBX ranges are both on sale, apparently the GBX is a new model but for this purpose I don't think they are really different.
It is a tiny little thing really, about a third the size of the 075 battery in the car.
Just in case anyone is ordering one - THERE IS NO PSU to charge it in the box as standard.
It is charged using the modern USB-C method which tops out at 60w.
A modern USB-C charger of 60 is recommended for quick charging as most phone chargers that are USB-C are max out at 10-20w.
A modern Mac or laptop USB-C model will usually be 45-60.
https://www.amazon.co.uk/Dell-Chromebook-Latitude-450-AGOL-2YK0F/dp/B077XY6F6Bhttp://www.amazon.co.uk/Spigen-Charger-Adapter-Charging-MacBook/dp/B099S1FGC1Also if you have a USB-C cable make certain it is a good one as 60w is a fair bit for a USB cable.
It was half charged and went to full in about 1.5 hours.
Attached to the Coupe and started first go which was a pleasant change of pace.
Despite the small size it has no issue turning the car over very easily.
You connect the red/black to the matching terminals, power up the pack and then have 60 seconds to kick the car over, the cables are quite short so if it is in the garage and access is tight have a friend!
As soon as I removed the Noco the car stopped so the battery had totally failed.
Swapped for the replacement battery and all was well.
It is now starting on the button without an issue.
So other observations.
1. The unit is Li-Ion batteries which if damaged can burn well.
2. If you are going to carry it in the car I would recommend putting one of the hard shells on it.
3. It looses power quite slowly when charged but a regular 3 month top up seems good based on the comments I have found
4. It has a normal USB and a USB C (which is in for charging and also out when not charging) so if you have a power cut it will charge you phone often
5. The case is a fairly tough shiny smooth plastic so beware of marking the car when you are using it. It can slide easily