Amaron 50Ah battery died and now my car's electronics are acting weird

I'm hoping someone can shed some light on this because I'm genuinely confused – I replaced the dead battery in my 2018 Toyota Corolla with a brand new Amaron 50Ah about two weeks ago, and while the car starts perfectly fine now, I've noticed a few odd things happening that weren't there before. The dashboard lights sometimes flicker for a second when I start the car, the fuel consumption display reset itself to zero, and the power windows seem to move slower than they used to, which makes me wonder if there's something wrong with the installation or if the battery is faulty somehow. I've checked the terminals and they're clean and tight, so I don't think it's a connection issue, but I'm not sure if these are just normal quirks that happen after a battery change on modern cars or if I should be concerned. I remember reading somewhere that some cars need to have the battery "registered" or the ECU reset after a replacement to avoid weird electrical behaviour, but I thought that was only for luxury brands. I came across amaroncarbattery.ae/50ah-battery-replacement-dubai/ while looking for guidance, but I wanted to ask the community – has anyone experienced weird electrical gremlins after putting in a new Amaron battery, and did they eventually sort themselves out or did you need to take the car to a mechanic? Also, is there any kind of reset procedure I should do, like disconnecting the battery again or leaving the car in accessory mode for a while? Really don't want to ignore this if it's a sign of something more serious. Any advice would be massively appreciated.

Everything you are describing is completely normal on a modern Corolla after a battery replacement. The ECU, throttle body, and power windows all need to relearn their positions and settings after power is disconnected, usually sorts itself out within 50 to 100 kilometers of normal driving.

Power windows moving slower after a battery change is a known Toyota thing. Each window needs to be manually reset by holding the switch fully down until it stops, then holding it up until it stops, one window at a time. Takes about two minutes and fixes the slow movement immediately.

Fuel consumption display resetting to zero is not a fault, it is just the trip computer losing its stored data when power was cut. Nothing to worry about there, it will build up accurate readings again over the next few days of driving.

Dashboard flicker on first start is worth monitoring for another week or two. If it continues past the initial settling period or gets worse rather than better it could indicate a loose earth connection somewhere rather than just the ECU relearning cycle.

Battery registration is mainly required on European cars with advanced energy management systems like BMW and Mercedes. On a 2018 Corolla it is not necessary, the car will adapt on its own without any dealer visit or special reset procedure.