I have a torch in which 3 AAA cells are put in (1.6 (new AAA) * 3 =4.8v). The problem is these are not long lasting and i have to change them after few days. What i am looking for is a rechargeable option. I cannot use 1.2v Ni-Cd(1.2 * 3 = 3.6v) regargeble as the voltage is too low and led is dim. Recently i extracted 18650 (LGABD11865) batteries from my Old Dell Laptop.
I used powerbank module to test it out with my torch light. The output is slighltly over 5v (around 5.11) and the light consumes around 1.3Amps. When the voltage is reduced to 4.8v (checked through power supply) the amps are reduced to 1 Amp which is reasonable as it wont consume more battery and the torch wouldnt heat up.
Can someone please help me in this regard i have very basic knowledge of Electronics i need 4.8v CV with atmost 1 Amps. Furthermore the torch can only take 1 18650 Battery along with 1 tp4056 charging module or small powerbank module (usb type A port removed).
Update: I used 3 new AAA batteries in the casing which came with the torch. The voltage when measured showed 5.01v but the current at full brightness was 0.5amps. I need a resister MOSFET anything which can lower the current input to the torch. At present when connected with 5v supply the torch takes around 1.23 amps.