I currently have more than enough batteries for my portable operating, both in LiPo packs (old ones, 18650/21700 cells from laptops, recovered vape cells) and LiFePO packs (RC Hobbyking packs, Eremit pack, 26650 cells). I really do not need more but I do keep my eyes open to see what is happening.
I was looking for something else on AliExpress and noticed all of a sudden that there are many, many vendors selling 4S1P 7000mAH (nominal 12.8V) and 4S2P 14000mAH packs using 32700 cells with integrated BMS. Last time I looked there were plenty of vendors of individual cells but either these packs are relatively new or I just never spotted them before.
Typical is a 4S1P 7000mAH pack with BMS that’s about 35x75x135mm and 580g. The BMS is good for up to 40A. Many vendors selling these for prices from £21-£26 for your first order. Subsequent price is double this. This is includes free shipping with a 7-10 delivery time. Some are offering deals of 4S1P+ 2A charger for approx.. £30. e.g. https://www.aliexpress.com/item/1005009475349087.html
The above is just an example of what is available, I haven’t bought one or dealt with that vendor. I make no representation of quality or otherwise. I’m simple pointing out what is available that I had not seen before.
My KX2 with a 4200mAH pack is good for 4+ 1.5-2hr activations. So a 7000mAH pack will be getting on for 8 similar activations before charging. Whilst it’s not 13.8V, I’d expect it to power an add on PA at the 25-30W level for a considerable length of time.
It will be interesting to see if these are rubbish, poor, average or excellent.