Auto Service: Tesla mobile service makes sound financial sense
Posted By RichC on April 28, 2026
One would think that there would be some financial incentive in being a do-it-yourselfer when replacing the low-voltage battery in a 2019 Tesla Model 3. It doesn’t seem to exist, at least in my Internet sleuthing and comparing of prices.
The procedure isn’t all that complicated and Tesla does a pretty good job of providing step by step instructions (as do videos and 100s of How-To posts) … but finding an appropriate high-quality group 51R battery at a good price isn’t easy. I looked around and could only find a few of them locally that were under $200 and those that were, seemed of unknown or questionable quality.
Hankook AtlasBX provides the Group 51R battery for the MF51R-430 (430 CCA) and MF51R-500 (500 CCA) models, which are OEM-standard replacements for vehicles like the Tesla Model 3 and Model Y.
Several do-it-yourselfers commented that buying cheap seemed not to last as long; they advised purchasing directly from Tesla service centers and mentioned that the price was about $130 (cheaper). 
I called the nearest Tesla service center and it was $135 (plus core charge which is refundable).
Now factoring in that I would need to remove the one from Brenda’s Tesla, put it in my BMW X5 35d (diesel fuel is expensive — the Hormuz Strait – Iran situation) and make the round trip to and from Cincinnati to purchase and exchange the battery, that’s at least $10 more dollar plus my time. Rethinking it … maybe giving Tesla Mobile Service a try isn’t a bad idea?
So I set up an appointment a couple of days out using the Tesla app and it gave me an estimate to approve: $174 in my driveway. Hm … this is a service model I can live with (I expected a much higher price). Yes, I can save $40, but the convenience and time element is well worth the few dollars.
As an aside: I created a PDF with a few links for a pre-2020 Tesla Model 3 low-voltage battery how-to.
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