I never bought battery for all the car in my house, my friend open scrap yard, so i just go there and take for free only... U will be surprised by how many battery is actually "misdiagnosed" or "scam" by mechanic.

Those are OG German made Varta AGM battery, black casing. Those light grey casing are made in Korea, those not so good. My peugeot is running a benz ori din70 AGM, 3 years 8 months old still can get full CCA. And i also keep a Benz ori DIN110 AGM, that one 6 years already still maintain 100% CCA.

Thanks to those people i found 1 month old battery at my friend's scrap yard.

U can try Kingbolen BM550, quite cheap and accurate, less than rm50 can get, youtube got ppl test it against Bosch battery tester and it is almost as accurate as the Bosch.

Redneck like me I don't just charge it using a conventional battery charger, I zap those battery with DC inverter welder, after zapping u can see the CCA improve. That how my scrap yard's friend lorry don't have to buy battery. And of course not all battery can be zapped, if u don't know what you are doing, you can end up with acid bath.

Some of it are sent in from walk in customer, that bangla worker also ask, eh battery baru 1 bulan sudah mau buang ka... that customer say, neh itu mechanic lah, sudah tukar lagi x boleh, lagi tukar lagi check baru tau alternator punya hal. Then every week will have this one guy come with a small van, he will unload on average at least 10 battery each time, and he can explicitly tell that bangla worker which battery still good working condition which is not, then the worker will separate out the working battery and when i test, that seller put his money where his mouth is. And this guy, how much money u give him, he don't care, he just take whatever u give him, he don't even care if he bring in a DIN110 but you pay him NS40 price, just as long as he walks out with money.

All i know is this is very good for the economy even though is dishonest or incompetent mechanic. And beneficial for people like me. And good for my scrap yard friend, pay lower than market value still got ppl willing to sell, then drill holes to the battery and brim it with water before selling to larger scrap, cause larger scrap they weight the battery instead of by unit and size. Then also beneficial to my other close friend, they need battery just let me know they get the battery for free (as long as they exchange their old one) and belanja me eat.

Ah when you say SC, last time my scrap collector friend go and pakat with the SC of the brand with tiger on it's logo. He offer them good price for the battery, with that this motivated the mechanic to entice and coax the customer into replacing their battery. Last i know they are so motivated until all the mechanic will come and queue up as soon as his lorry arrive just to sell him the battery. U see... like this good for the SC in terms of sales and those mechanic, with the xtra money they can go and spend it and treat their family to a nice meal. This is what i called help drive the growth of economy...

But yeah the X50 really got prob... like 9/10 the battery is really bad.

Then you ask back the customer loh... If you as a battery manufacture do you want your battery to last like super super long? So long that people who pakai your battery don't have to change battery making your business turnover rate super low till gulung tikar...

The scrap AGM in my turbo diesel has been a few months, every week i monitor the CCA and internal resistance and it never drop and increase. EFB i don't bother to take, they always arrived like super super dead, can't even power the battery tester that kind of dead. Normal RFB, for my own car only target those which were like super new and sold to scrap simply because of alternator failed and can't charge the battery. Like i just got a Amaron 65d26L 420CCA rated but tested 500CCA. Yes... i understand about the fact that SLI battery sulfation will occur when it is deep discharged. Expect maybe can use for 1 year? Those Century and Motolite NS70 and D23 tends to be good, if the CCA is low, i just have to zap it with DC welder can regain 100-150CCA, improving it very close to factory rated CCA. Those use on lorry so far already more than 6 months still going strong. So far the oldest battery i put on my diesel car is the Merc OE AGM which was approx 3 years + when it was send to scrap.

Just go and buy an inverter DC welder and try it yourself

Mechanic love to use portable jump packs to jumpstart customer's car, and these jump pack has battery which are half the size of myvi NS40, jump pack may have something like 18-22 AH battery while a NS40 can have 35-40 AH. And yet those thing are perfectly capable of jump starting car with bigger battery like DIN70 and up. Thus a NS40 is more than capable of doing that.