Light weight car battery

[Rick2018]

Hi all merry Christmas to you all.Im trying to shed some weight in my car while keeping it as a daily driver. It's kinda a bit of a project of mine. It's a 2004 astra 2.2 sri, I'm after a light weight car battery that I can use as a daily driver with no issues my current battery must be at least 20kg .I was thinking of going with a lithium battery but never used one .Any ideas

[f1nn]

I use lithium batteries in motorbikes, but i’d suggest you’d be wasting your time with one in a car, you;d not notice a difference.

[Chromed]

I use one, saves around 17kg.

[GreenV8S]

Rick2018 said:

I'm after a light weight car battery that I can use as a daily driver with no issues my current battery must be at least 20kg

For a daily driver I suggest you ought to aim to keep the energy capacity close to the original, which means you'd end up paying a lot for the non lead-acid battery options. How much money and inconvenience are you prepared to pay to reduce the overall vehicle weight by maybe 2%? (Remove the heater, seats, sound insulation etc would give you much greater gains.)

I suggest that 2% during the daily drive is irrelevant. A technique I've seen to get that 2% during competition is to fit two small gel batteries in parallel with a quick connect/release so that one can be removed during the actual competition. IMO there are other more productive ways to save that 2% if you're serious about it.

[fightingtorque]

There were a couple of companies exhibiting at Autosport. One is www.super-b.com . I think wosp performance also had them.
They contain standard 18650 cells as used in laptops and electric cars, in a box. There are some things to bear in mind: lithium batteries should be protected from overcharging otherwise they might blow up/ catch fire. The people were talking about a relay that drops out when it is charged but this is not included with the battery.
I think the improvement is on the limit of what you would detect in an Astra, but if you make two or three undetectable improvements then suddenly you have a detectable improvement, so it could be a good idea (I'm thinking about it for my Scimitar) but don't know the cost yet. I'm thinking I'd like to 3D print my own enclosure and just buy some 18650 cells and build it that way. If it turns out not to be big enough, I can rebuild it with a bigger enclosure and more add more cells.

[Rick2018]

I was thinking about the odyssey pc680 battery. For a daily driver