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Ohmmu 12V Lithium Battery

17 reviews

Ohmmu 12V Lithium Battery

17 reviews
Model: Model S

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Installation Level: Intermediate

Installation Intermediate

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Say hello to a light-weight, improved performance 12V lithium battery.

Many report even your audio system will get a boost! Comes with manufacturer 4-year limited warranty and is rated to last up to 8 years.

4 year full replacement warranty
Battery Management System (BMS) prevents damage to battery in extreme conditions
Only 8.5 lbs
195mm x 122mm x 205mm (plus 20mm for lugs), 8.5lbs


  • 12V battery
  • SAE adapters (Only for Model S)
  • Install guide 


  • Lithium Iron Phosphate Battery (aka LiFePO4 or LFP)
  • Available for all Tesla models

Most customers install this themselves.We recommend watching the how to video to ensure correct usage.

Installation time: .5 hours

How to Video:

How many amps is this battery

>40Ah True Lithium Capacity on 5hrs Discharge Test (more aggressive testing than Lead Acid)

Can I install this myself? 

Absolutely! We have a step-by-step video instructions on our support page here.

This item is non-returnable. 
Customer Reviews
4.7 Based on 17 Reviews
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Hsiao-Ping H.
United States United States

Great customer service

All my questions were answered in a timely manner

Hsiao-Ping H.
United States United States

Great products, excellent customer service

Customer service answered all my questions promptly via email

United States United States

Easy job

Good install video , perfect fit. Love it!

United States United States

Easy replacement, a little expensive.

First, this is a great battery. Some said it improved their sound system and it actually does! I have a very early build 2018 M3, payed extra for the enhanced sound system. This battery made a big difference in quality sound that was already there. The You Tube video is easy to follow, no install worries at all. After having my car for 3 years and 6 months it was a matter of when the OEM battery was going to give up. And would probably be at the worst time in the winter. The only downside is the $500 price tag. If that’s what it takes to make this battery at a fair price so they can make a decent profit, I’m good. If you can afford the car, you can afford not to “cheap out”. I like the 4 year No question not prorated warranty a lot! Let’s hope I never need it.

Johnson P.
United States United States

My Tesla is now Complete

Bought this battery for my Model 3 because I got a fault from the factory one. Freaked me the heck out because creating an appointment in my area to get anything on my car fixed is a nightmare. Tesbros and this battery helped eased my worries by showing me how to install the battery with their install video, backed by their warranty. This battery is much lighter than the factory one and I noticed improvements in my speakers after making the switch which was a huge plus for me. Anyone having problems with their 12v battery I highly recommend this battery and Tesbros.