4 ms·
> "A 10kg battery would be beyond sufficient" I don't have the exact weight, but Tesla's LFP low-voltage batteries weigh far less than that. Around 2kg at a gu
by Reason077 1y ago
> "A 10kg battery would be beyond sufficient"
I don't have the exact weight, but Tesla's LFP low-voltage batteries weigh far less than that. Around 2kg at a guess.
Rating is 12.8V nominal, 12Ah, 153.6Wh. Not all that much bigger than a laptop battery!
- ajross 1y agoBecause it fundamentally is just a laptop battery. The job of the 12V bootstrap battery is to bring the main control hardware (not even the MCU, I don't think) online so that the DC/DC converter can power the 12V bus from the main battery. There are a few other systems that expect to be powered in the event of a main battery failure, like door locks and charging. But I really don't think hydraulics like power steering/braking are on that list. The fallback for hydraulic failure is manual pressure, just like it is on any car. It's a naturally redundant system.
- xxs 1y ago2kg would be a monster of a laptop battery of course, esp since it's regular Li-Ion (not the one w/ Fe/P). LiFePO4 should be ~150Wh/kg. So indeed, the battery is 'tiny', like 1kg only. Yet, it'd have no issue supplying the brakes - it's less than 10C discharge rate. LiFePO4 tends to have much higher discharge rate which is the important part not the total capacity. Either way, the battery is indeed 'tiny'