How to take apart Clevo battery module (w370bat-8)

Not sure what you mean by the replacement modules are all old, (unless you mean from the manufacturer sitting on the shelf too long?) but you CAN buy non-OEM replacements on line, one example is HERE. As for them being non-OEM, well, the cells you want to put in won't be either... (just search your Battery model number for more, read the customer reviews and I'd also check them out HERE to avoid a bad battery.) But Yes, replacing the bad cells IS possible... doing it properly though, you will need to spot weld some of the connections, something most people are not set-up do do. You CAN jury rig one, but the effort, cost and difficulty of replacing the cells makes it something I only do when I have no other option. It's risky... (easy to screw up, the videos make it look relatively easy to open the case, but many can't be opened without actually cutting your way in which makes reassembly another problem) and you must make sure the cells you put in exactly match the ones you took out... it should really be ALL of them (because new and old cells even if good are harder to balance and that makes failure of the older cells more likely), not just the bad ones, also, when you are done it may not work without resetting the charging board (BMS or Battery Management System chip), you can find how to do that on line, if necessary, it isn't obvious and many folks think they screwed something up when the battery won't work properly so check that. I'd tell you, but I've forgotten how to do it and you can search it as easily as I (I'm lazy, it's almost bedtime here... that's my excuse and I'm sticking to it) You can find videos showing how to do the replacement, but I'd just buy a new one since they are available. In any event, piercing or shorting cells while working on them must also be avoided... or denting them so force, plus delicacy (caution) are needed. Research it and take appropriate safety precautions. Best not to do it in the living room or on the kitchen table consider hazmat and fire precautions but these are somewhat less for this type than the newer Lithium ion packs on newer devices. I'm not really trying to discourage you, but in my opinion, it's not on the EASY list.

Good Luck

Okay, it's morning and I am not tired and sleepy so here is a bit more that may help you if you decide to do the repair...

Video 1 shows repair without spot welding Here.

Video 2 is another example.

I don't like the soldering technique (you Don't want to over heat the cell) I like THIS

method better.

The BMS may prevent you using the battery after you've done the repair as mentioned above, the method I used is in this Video. it may not work for you.

There are other things you can try like THIS if that fails, otherwise scour the web for other possibilities, perhaps you'll find a work-around the works for you.

Again,

Good Luck