Changed battery from Panasonic Q90 to Lifepo4

[ciforia]

Thought maybe good to provide info here


Just changed my '21 CX9 battery to LFP

I think overall is a very solid upgrade from OEM across all dimensions, comparison below

LFP 12v 75 Ah vs SLA 12v 69Ah (Q90)
CCA 1350A vs 620A
Weight 7.2kg vs 17.5kg
Usable capacity 75Ah vs ~35Ah
Cycle 2000+ vs 500
Price $200 vs $200

During cranking (quick draw of 127A), SLA voltage dropped to 11.15, LFP only sag a bit to 12.90v

Could have gone with 12v 60ah (900A CCA, $150),12v 45ah(750A CCA, $115), or heck even 12v 30ah (550A CCA $85) as 2.5T engine only draw 130-200A of current during cranking, also given usable SLA capacity is essentially half Lithium battery

Note that I live in tropical region, so no need to worry about extreme cold temp (-20 and below, where LFP struggle to operate)

Only issue is on forscan, battery SoC is reported at 0% as Mazda BMS is tailored for SLA. But that is a very minor reporting issue & does not affect any functionality as far as i'm aware of (even i-Stop is running normally, and even longer than vs using Q90 as voltage drop during start stop is very minimal)

let me know for any question, pic below

 

[CX-DM]

Very cool info. I didn't know batteries came in LFP.

How can it offer such superior performance at the same price?

Any downside you see in switching to LFP?

 

[ciforia]

Very cool info. I didn't know batteries came in LFP.

How can it offer such superior performance at the same price?

Any downside you see in switching to LFP?

If you compare it with OEM / start stop battery its cheaper as lithium price has crashed down in the last few years. You can definitely find cheaper one (but total cost ownership would still be higher as you need to replace it, vs LFP which i would say is a lifetime battery for a car


Only downsidr would be if you live in extreme temp area where perf drop significantly