What circuit to build to evaluate 18650 cells ?
Lithium cells salvaged from used battery packs do have an use in hobbies and general applications.
As some cells may be weak, I would like to build a circuit to evaluate their health state.
For a given -say 2.0 Amperehour- rated cell, what load resistor value should be convenient to use for how long and measuring what curve of voltage drop during the discharge test in order to qualify the cell as 'good' or 'useable' or 'bad' ?
(+)---------------V(+)-----------------R
Cell
under
test
(-)----------------V(-)------------------R
[ Voltmeter connected at V; resistor connected at R ]
Lithium cells salvaged from used battery packs do have an use in hobbies and general applications.
As some cells may be weak, I would like to build a circuit to evaluate their health state.
For a given -say 2.0 Amperehour- rated cell, what load resistor value should be convenient to use for how long and measuring what curve of voltage drop during the discharge test in order to qualify the cell as 'good' or 'useable' or 'bad' ?
(+)---------------V(+)-----------------R
Cell
under
test
(-)----------------V(-)------------------R
[ Voltmeter connected at V; resistor connected at R ]