Tesla is updating the Model 3 and Model Y Rear-Wheel Drive variants with new battery packs. This new pack will replace the current BYD Blade pack in these vehicles. Its interesting to see Tesla making battery pack changes to vehicles, especially in light of recent news on Tesla working with its cell manufacturing partners and internally to make better batteries.
Let’s take a look at this potential upgrade that was spotted by @eivissacopter over on X.
The CATL 6M Pack
The new pack, which is likely replacing the current BYD 7C pack in the Model 3 and Model Y RWD variants, is going to be called the CATL 6M. The last time we had a CATL LFP pack in the RWD variants was back in 2021.
This pack will be bringing a 6% increase in overall capacity, from 60.1 kWh to 62.5 kWh. At about a 4% increase in energy, it’s not a huge jump, but the pack is also expected to bring improved charging performance due to a higher nominal capacity and voltage. Another benefit will be its reduced mass, with the new battery pack being about 44 pounds (20 kg) lighter. These items all contribute to range and charging performance, so we could potentially see a range increase in these RWD models.
However, Tesla previously software locked the extra 2.5 kWh to match the BYD packs that were being shipped at the same time as the CATL packs - which mostly just resulted in slightly improved charging performance and better battery longevity.
Pack Chemistry
This pack is an LFP - or Lithium Iron Phosphate. LFP packs have more stable chemistry, resulting in less degradation, but less energy density for weight. They also perform poorly in contrast to their NMC siblings in extreme cold or extreme heat. However, they can be charged to 100% all the time, and Tesla actually recommends this. We wrote about Tesla’s battery tech in detail, for those looking for more information.
There is a possibility that manganese will be introduced into this new pack. Manganese improves energy density, and also helps with low-temperature performance, which would help to mitigate some of the concerns with today’s current LFP packs in places that see cold weather on the regular, like Canada or the Nordic nations.
Release Date? North America?
This battery back likely won’t come to North America now, due to tariffs against Chinese batteries and cells. Customers in Europe, Asia, and other markets can expect to see these batteries in their vehicles sometime next year while Tesla works on other solutions to provide the North American market with a cost-competitive LFP pack that’s sourced from materials within the continent.
