Do you remember what problems you heard about the restart batteries? They sell it as a direct replacement they guarantee to work with any unmodified charging system. I haven't had any issues at all yet and the car has started after just sitting for several days but I'm not sure what I would be looking for other than a no start condition. All the electronics in the car are working the same as they always have. Both batteries are class H6. Maybe some people weren't charging them before install per the directions or using the wrong charger damaging the battery. The owner's manual for both the battery and the car itself are very particular about the way this install is performed and I'm sure plenty of people skip the directions being it's just a battery swap. Some people buy smaller ones but then you need to build brackets or secure it in some other fashion. I'm keeping the lead acid battery to test other electronics and as a backup.
6.3 kg which is a savings of 14 kg, in English 30.8 pounds would be off the car! Cool, I might do the same! Thanks for your advisement!!I installed an anti-gravity battery about 2 weeks ago. I just wanted to run it for a while before posting. This is a direct replacement the same size as the OEM battery that weighed 30.8 pounds less than the OEM battery. No issues whatsoever. The factory battery screw down clamp works with it as well. They do recommend charging it before you use it the first time and being it is lithium you have to use a lithium battery charger. I used a slow trickle charger and charged it overnight so it was ready the next day. Make sure you read all the instructions and the Ford manual section on replacing batteries before beginning the install as the vehicle likes to learn the state of charge with doors locked at rest for 8 hours from what I remember. The only downside is that it is expensive. I think I paid about $1,000 for it but it also comes with a restart feature and a small key fob. If your battery ever dies you can jump start the car at the push of a button as it is an intelligent battery that keeps a reserve in case you forget to turn your dome lights off or anything like that. They have different amp hour recommendations depending on your climate but that is all explained well in a video on their website. The model number I used is on top of the battery. I live in the mid-west and the car is garage kept.
OEM:
Anti - Gravity:
