Replacement 12v battery

[ArthurUK]

Swapping the Lead Acid Auxiliary Battery for any kind of Lithium Cell(s) Battery is the issue.
The dedicated charging system for the auxiliary Battery is designed for Lead Acid.
Its unlikely Mitsubishi would approve this change, so the warranty would be void.

Whatever flavour of Lithium Battery is safer is not relevant.

 

[yardbird]

I had extended warranty till 90K and had no problem in obtaining warranty services at all. e.g. got the following warranty services as such.
1. The whole front axle was replaced by dealer for one leaking boot.
2. The front suspension system was replaced due to bad shock & broken dust boots replaced by third party paid for by the warranty service company.

Mitsubishi extended warranty never questioned the lithium battery at all. My 2018 PHEV is now over 92K miles. LiFePo4 12v battery in my PHEV has a built-in BMS chip inside to regulate any overcharging from the main battery pack. Other than the 10-12 EV miles, Happy camper!

 

[HHL]

The Outlander charging circuit will be designed for Lead acid, the charging V/I profile is very different to Lithium.
Plenty of advice on Google, this explains the difference:
https://enerdrive.com.au/2024/07/24/can-i-charge-my-lithium-battery-with-a-lead-acid-charger/?
You run the risk of it catching fire.

It seems to be simply a constant voltage charger, it is not current limited to what the specification on the original yuasa battery recommends. No fancy profile there..

 

[murlandphev]

Wanted to thank this thread for helping me change my 12-volt battery from the Yuasa S46B24L(S) to an Optima D51R AGM on my 2018 SEL. It's been installed for about 2 days now and fit just fine. I'm here in the US and that original battery was near impossible to find.

Two words of caution

1. The reason my original battery died was because I had a dash cam installed and for about 2-3 weeks, I did not drive my 2018 leading to what I surmise slowly drained the battery and in cold weather killed it. I attempted to trickle charge the dead battery to no avail. Therefore I will be disconnecting my dash cam whenever I leave my car idle for long periods or leave the car plugged to the wall charger.
2. If you are in the US, avoid purchasing anything from www.sparkswarehouse.com. I should have researched it more but I was desperate to find an original S46B24L(S) and they seemed to be the only game in town with a express delivery. After the original online purchase two weeks ago, no status updates, no tracking number and no responses to calls and emails from me. I hope they get in touch with me soon but it may be the dead battery cost me much more than just a single replacement.

Link to Optima battery
https://www.amazon.com/dp/B0013ZGZ9Q?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1