Tesla Model Y (TX, 4680): battery issues and zero repairability

Tesla began producing Model Y with 4680-format batteries, including at Gigafactory Texas — these cells were supposed to deliver more energy and improved efficiency, but the first batches show their newness and complications.

What 4680 batteries are

4680 batteries are a new large-format cylindrical cell developed by Tesla, with the potential for higher energy density, lower internal resistance, and faster response compared to previous formats.

How to tell remotely that a car has a 4680-cell battery

1. Car weight 2366 kg
2. Built at the Texas factory
3. AWD, but without "Long Range" displayed on the Software screen

Production and reliability problems

• Mass production of 4680 cells is harder than expected, and Tesla continues to struggle with quality control and scaling.
• Despite reliability promises, independent expert teardowns show that the structural battery pack can be very difficult to service or repair. To gain access to the internals, technical teams have to use special methods (e.g. dry ice), and there is a risk of breaking connectors.
• Some reports state that the battery pack is almost unrepairable after serious damage, which is why many cars are simply written off.
• In September 2023 Tesla halted production of the Model Y with 4680 (the cells were redirected to the Cybertruck); the version returned in January 2026, now with a fully dry electrode, and by spring 2026 such cells appeared in EU builds as well. Meanwhile, the data shows worse energy density (244 vs 269 Wh/kg for the 2170) and a drop in charging speed.

Charging and balancing

Engineering discussions and owner feedback indicate that the DC charging speed of 4680 batteries is sensitive to thermal conditions — the peak of about 206 kW drops off quickly, and balancing under load may not be as optimal as expected at the start of production.

Conclusion

4680 batteries are a technological step forward, but early Model Y units with these cells show:

• complex service maintenance;
• potentially expensive repair cases;
• uncertainty in behavior under prolonged load.

Buyers should consider that this is an experimental configuration that may differ in reliability and service cost from classical 2170-format batteries.

Community experience TESLA Belarus

Analysis of 400,000 messages from the TESLA owner's group BELARUS chat — the scariest topic in the chat. The community's advice is unambiguous: stay strictly away.

Practical advice from chat:

1. HOW TO IDENTIFY: look at the weight sticker — if it's 2366 kg, it's a 4680. Also: built in Texas (factory letter in VIN), Dual Motor configuration only.
2. DO NOT BUY under any circumstances — zero repairability, repair costs astronomical money.
3. Insulation in working condition should be 3500+, with contactors open — 10,000. Ideal: 4300–4800.
4. If you've already bought one — set aside at least $10,000 for a potential repair.
5. When buying a MY 2023+ from the US, avoid the AWD trim from Austin with 4680 cells (these are Tesla's own cells); the safe choice is Long Range/Performance on 2170 (Panasonic or LG; LG is slightly slower at Superchargers).

Member DieHard went the whole path from "brick" to revival — spent significant sums.

Who reported the issue: В, DieHard, Igor_soul_kitchen, A, Vitali K

Who found the fix: Zverski, SΞDΞK, Винсенте Дель Пухини, А M, Denis, Stinger, Yauhen, DieHard

Discussion in Telegram: #318579, #283241, #240085, #324478, #340418, #249693

Additional sources:

• Munro & Associates: Tesla's 4680 Structural Battery Pack Has "Zero Repairability": https://www.autoevolution.com/news/munro-associates-tesla-s-4680-structural-battery-pack-has-zero-repairability-193430.html
• Tesla Model Y 4680 structural pack — end of cheap battery repairs: https://www.notebookcheck.net/New-Tesla-Model-Y-structural-4680-cell-pack-spells-the-end-of-cheap-electric-car-battery-repairs.634847.0.html