Lead ACID vs lithium iron phosphate
only 60% 10 times more no of times rechrges - cycle life. 4 times more faste charing 55% lighter
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efficiency of power bank checked and found efficiency of 65% to 68%for new one.
https://www.amazon.in/dp/B0C2YR4MV6 which is 5kmah 3.7 volts = 18.5 watts rated capacity it could charge up to 17 watts with 9 volts but at discharge it could give only 11.7 watts which is 68.9% efficiency in 1.4 hours time when charged with 5 volts it gave 65% efficiency
RUIDENG HD25 HD35 adjustable DC load tester 5-20 volt 35 watt Load tester for batteries with voltage current display
we can test batteries and power sources power banks with a meteer in between to test max capbilities or if rated rating are correct. we can set voltage from 5 volt to 20 volts with button and adjust current with a rotating knob. Max power is up to 35 watt. this is tested in the bellow video. https://robu.in/product/rd-hd35-trigger-qc2-0-qc3-0-electronic-usb-load-resistor-discharge-battery-test-adjustable-current-voltage-5a-35w/
how to run laptop with 12 volt battery using dc voltage booster module
dc voltage booster https://www.electronicscomp.com/sx1308-dc-dc-step-up-adjustable-power-supply-28v-2a-1.2mhz-power-booster-module?gclid=CjwKCAjw-7OlBhB8EiwAnoOEk_cF9XpBl1__Xu8c9XamW1mqByH_IQ9PL6KOH088v7UhBJj61cFQchoCTmkQAvD_BwE
controling toy car with 8051 microcontroller and arduino using bluetooth
https://circuitdigest.com/microcontroller-projects/bluetooth-controlled-robot-using-8051