My partner got it from Shopee Machines official store with the price of RM3449 (after discount and promo).. definitely worth it compared to the m2 pricing around RM5499

I think it really depends on how you use your macbook and the way you charge it. Are you always charging it while using? Or do you charge it only when it is really low? Do you charge it to full 100% every time?

My advice is, try best not to use it while charging if possible.. the reason it stops at 80% is because of the system's optimized charging.. it will slowly charge from there onwards.. I always try not to let the battery drain to low percentage.. usually when it reaches around 40% then I will charge it to 90% only, not 100%. You can also download this app called AlDente, it helps with your battery's charging and discharging.. try exploring it and see if it helps

I was recently in the 2nd hand market for MBA M1, looking at prices around 2.9k to 3.3k, which I think wasn't worth it cos Apple was having sale at rm3599. So personally I think it's not worth to trade in for an iPhone currently cos the price will definitely be low. Plus, 91% isn't too bad; it's still great!

It’s definitely still far from needed to be replaced, you can still use it for a long time. As for your battery cycle of 81 only, it’s cos you plug in your charger all the time, hence the cycle count is low. For example, mine is close to a year and half but I have 280 cycles and 89% battery health

Yes that's what they recommend, but until then you still have a long way to go to 80%. Anyways, if you check the system report, you can see the battery condition. If it's normal then you are still good to go with it; don't worry