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I found theese...

If you want to go the diy route: https://circuitmaker.com/Projects/Details/Craig-Peacock-4/LT8490-Buck-Boost-Multi-Chemistry-Battery-Charger-with-MPPT you can request the lt8490 ic for sample for free from analog devices.

Hi. I've bought 18650 batteries from aliexpressbefore. I was wondering if anyone here has bought 18650 from Taobao as their prices are a lot cheaper. Although the cells are not "name brand" their seems to be good deals like 2600mah for $0.80 and 3000mah $1.25. These listings have many orders and...

What about using a ltc3300 for balancing?

https://www.imrbatteries.com/samsung-40t-21700-4000mah-30a-battery/ -- 4s2p would be 8000mah 60amp discharge 544grams https://www.imrbatteries.com/samsung-30t-21700-3000mah-35a-battery/ cheaper option: https://www.imrbatteries.com/samsung-30t-21700-3000mah-35a-battery/ - 4s2p would be...

I saw some Toshiba 2.4V 20AH lto for $14 usd piece

They are 50 cent each on aliexpress. I found that if you charge at two amps without a heatsink they overheat and die

These are lipoe4 right?

Congratulations on your first time. I hope it was pleasurable.

https://www.aliexpress.com/item/7S-29-4V-8S-24V-Lifepo4-10S-36V-Li-ion-Bluetooth-Smart-BMS-with-30A-to/32840764349.html?spm=2114.search0104.3.3.40a23b03qyjA7x&ws_ab_test=searchweb0_0,searchweb201602_2_10152_10151_10065_10344_10130_10068_10324_10342_10547_10325_10343_10546_10340_10548_10341_315_10...

you would probably want to spot weld them

theese are $50 and seems to have good reviews...

Yeah seems like a good deal. If assuming the batteries are at 90% capacity remaning. (Only 1 year old so they maybe better). It comes out to $125usd or 95 pounds per killowatt hour.

Well once the bms trips at 2.5v (underload) the battery voltage normally jumps back up to 3.2-3.5v

If you don't mine cutting your own: https://www.aliexpress.com/item/5m-PVC-Heat-Shrink-Tubing-Tube-Wrap-Kit-For-18650-18500-Battery-Flat-Round-18-5mm/32838686288.html?spm=a2g0s.9042311.0.0.27424c4dL7PR7T 18650 shrink wrap cutting jig: https://www.thingiverse.com/thing:2954277

Subed

You should do 24v led strip and use 7s. More efficicent and can run longer length strips. You could use this DIY Kits Solar Lamp Board Control Sensor Lithium Battery Charger Night Light Controller Module Home/Outdoor Circuit Automatic http://s.aliexpress.com/UbYVVfui?fromSns=Copy to Clipboard...

Hi another member on this forum is selling new boston swing 5300mah for 4.50 each.

Just made this cup

$2 12v imerission heater running off 4s25p