General > General Technical Chat
20V battery
bastl_r:
It probably won't be quite that bad.
With only 1500mAh, they have enough space for active material. Moreover, the device manufacturer has almost no influence on the current consumption. I therefore think that 20A is already in there. If in doubt, a hopefully installed temperature sensor should put an end to the game.
Nevertheless, the 1500 cells are a rip-off.
I think that of the specified 1500mAh eh only 1200 - 1300mAh will be usable --> 3min at 20A...
jogri:
What? No, that's not how batteries work. They don't have "more space", they just use a shitty cell chemistry. Yes, there are cells that are designed for high current and use a cell layout/chemistry optimised for that instead of high capacity, but those crappy cells definitely aren't.
Also, your 20 A figure is VERY high for good cells and catastrophically high for that crap. As you've said yourself, that would be a 20 C discharge for those. LG/Samsung cells are normally rated for 10-20 C, i definitely wouldn't use more than 3-5 C for untested garbage.
NiHaoMike:
I never really liked the "compact" versions of power tool batteries. The larger ones put much less stress on the cells so they fail less often.
BeBuLamar:
--- Quote from: themadhippy on December 27, 2022, 05:48:49 pm ---Id go with no one knows ,the battery pack claims 20v at 2.0AH ,but 4 x 3.7v is only 14.8V and 1500mah is a bit short of the claimed 2
--- End quote ---
The pack has 5 cells but also look at the * at the bottom of this page and you see
https://www.craftsman.com/product/cmcb202/v20-20ah-lithium-ion-battery
"*20V MAX battery, maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18."
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