replacement of 12v aux battery before winter

Hello everyone, I browsed through the forums and could not find an answer in regards to Group 35 AGM battery being okay for 2nd gen prius. When i check the voltage on the battery on maintenace mode (2 power button clicks without turning the car fully on). It will read around 11.9 which is getting pretty low. I don't want to be stranded in middle of nowhere in Canadian winter. I checked the battery year and it is dated back to 2011, so I think its time for a new battery. I saw a group 35 AGM battery from costco. It is rated for 55AH " Energizer 35 AGM battery". specs are:

Amp Hour: 55
Battery Type: Absorbed Glass Mat (AGM)
BCI Group Number: 35
Brand :Energizer
Cold Cranking Amps :650 Amps
Cranking Amps : 800 Amps
Reserve Capacity: 100 Minute
Voltage: 12 Volt

Is this battery too big where my charging system will have an issue charging it up fully while driving? I looked at my original battery and it is also rated for 55 Amp hours so I think that is okay.

Thank you

 

yes, I know the posts will be SAE on the new battery and I will have to convert my prius cables. My brother is an automotive technician, so ill have him convert my positive and negative cables.

 

Yeah, I saw the canadian tire offering. I refuse to buy any batteries from them anymore as their warranty is honestly one of the worst ever. You have to have a phyiscal copy of the receipt for them to warranty your battery. With costco, the AGM's have a 5 year free replacement warranty and another 3 years after the 5 year prorated, no receipt needed as it is on your costco membership card. Canadian tire I think also offers a 3 year warranty. the Costco battery was also going for 169.99 in store today. pretty huge savings+easy warranty claims in comparison to the minimal hassle converting JIS to SAE.

 

Oh i did not know the prius's battery is group 51. I think my brother can somehow fit it in there with a few modifications if needed. I will look for a group 51 AGM then, if i can't find a reasonably priced one then ill just get the group 35. thank you !

edit: Yeah, I just went on costco's website, they also offer the goup 51R AGM battery, but it only has 41 Ah. If i could fit the group 35, should I just go for it as it offers 55 Ah?

 

My prius has SKS and pretty positive the stock battery is the s46. I have seen some non sks prius's having the non sks battery (S34B20R) that has 36Ah