Will this work to increase running time of battery

[mrel]

Hello



Got 100 amp hour ,12 volts AGM battery.

Will this increase running time of of 12 volts battery, using LED 12 volts ,10 watts led.

if I get buck converter board to drop the 12 volts battery volts to 5 volt,
and hookup Boost converter board to buck converter board to boost the 5 volts to 12 volts will this extend the battery running time longer since the battery only put out 5 volts and boost converter is creating 7 volts to make total 12 volts .
Will this work?
mrel

 

[Kiwi]

Afraid not, it will be worse.
You will lose efficiency converting 12v to 5v and then again boosting 5v back to 12v.

 

[Audioguru]

Converters work hard and produce some heat. The heat is wasted power from the battery.
Does your 10W LED have something to limit its current? Please post a link to the datasheet of the LED.