What's wrong with only using 20 amp batteries? Huh? Huh?

I only use 20 amp LG HG2 18650s.
I have two 'married' sets of these also (a year old), use in a mod & tank running .45ohms at 35-45W. Got these from a very reliable eBay seller in Genuine Cells, he's never sold me fake batteries. Also have a slew of the 2500mAh LG HE4's, am considering using these to rebuild my notebook battery pack. Have seen several YouTube Videos on how to w/out damaging the case, these can often be opened with a heated knife included in some torch kits.
The tricky (& cautious) part is making sure the assembled pack is
exactly as when disassembled & carefully using a soldering iron to reassemble. Then once back together, charge with the notebook's power brick, not before building in the usual vape charger.
The cool thing about the HE4 is when the device shows it's low, still has a good charge left, usually around 3.8V left, or barely under. With the Sony VTC5A & HG2, much lower, around 3.4-3.5W, low for my comfort, causes excessive wear on batteries. So I have to watch the charge level when using these.
One thing I've noticed, even vaping 60W at 0.15ohms, the amperage on my Sigelei KAOS Spectrum mods shows well below 20W, sometimes below 10W, regardless of battery. I like this real time feature, plus how the draw shows the 'pull' voltage drop.
At any rate, am well stocked on batteries, have 5 sets of Sony VTC5A's stored in a dark, cool place, along with two sets of the 20amp Sony VTC6, a purchase made thinking it was better because newer. Got caught off guard, however these are still great for low wattage vaping & offers lots of capacity at 3000mAh.
The main thing here, there's no 'one size fits all', although at the prices of the VTC5A on
www.illumn.com, why pay for lower rated batteries? Even when vaping at low wattage, these holds an excellent charge, and best for all mechanical mods. Shipping is free for over $50 purchase, so if the cart is around $40, may as well get two more batteries (one set) & have more for the money. While it shows at checkout that free shipping is 7-10 days (or so), Illumn uses the same 2 day priority shipping, my order arrived 2-3 days after checkout. Considering it was after 5PM at the time, in my same time zone, Illmun has excellent customer service, I highly recommend the corporation to anyone where they'll ship to.
A final note, to save wear & tear on the mod and for best charging results, it's best to use an external charger at home. Use the included USB cord only when needed &
always carry a spare set in a plastic case which are often included. Most of the best sites will include cases when purchasing two or more batteries, will usually state this on the site. If not, be sure to grab a few dual or 4 battery cases for travel protection. Safety comes before anything with batteries, please don't take this for granted.
Cat