Somebody should really sell a little dongle to go between a Dell laptop and any off-the-shelf charger. For bonus points you could make it programmable, to report anything you wanted/needed.
delegeferenda: Pretty much all laptop batteries since the switch to lithium based cells have integrated charging circuitry. These accept a wide input voltage range and buck it down to charge and balance multiple banks of cells at a constant current/constant voltage cycle.
One laptop battery I recently tore apart had a TI bq20z45 chip inside, a programmable chip for 2 to 4 lithium batteries in series accepting an input voltage between 4.5 and 25 V. Another battery, from 10 year old LG, had a bq20z80 monitor chip and a bq29312A balance charger chip, accepting the same voltages.
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