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This is not 100% right. Not all grade B batteries are like this. You posted 8 disadvantages for grade B cells. Some grade B cells appearance is really not good but other aspects are great.They are full capacity, they are normal for the voltage, and they are fresh. but some grade B are not like...

i think you need to build another battery pack with the same cells, if the current pack is 304AH, the other one also use 304AH rather than 280AH cells. Parallel them. and also you need to make sure the two packs voltage are balanced and make sure the BMS is working in this way which support...

EVE280AH Grade B is really in short supply. if you want the similar capacity with similar size, LISHEN272AH, CATL271AH,REPT280AH are more closer to your needs. EVE230AH is fine if you don't mind the 50AH capacity lower. the trend of the battery price is rising. this is true.

4.15KG /pcs net weight

HAHA i watch this forum long time ago but i didn't register till today. oh thanks for reminding. that is another cell not the 230AH. i ask my warehouse people take a picture just now. this is the real appearance of the EVE230AH. There is another one with square terminal. see the photo below.

Actually the batteries have no stud or screw terminal inside originally from the factory. these parts are added later. Nearly all chinese suppliers will add these terminal before sending out abroad since you guys have no equipment to welding. Do the welding also need some cost.

You bring up a good question. for this model we only weld a stud upon rather than drill a hole internally. Some cells can be drilled with a hole some can't . There are experienced people who is good at it. Must be zero risk! on the whole we recommend the stud but some customers prefer drilling...