The AAA ones leak too. Used to be a firm believer in the coppertop, but have since switched to the "bunny". No leaks with them so far.Only seems to be the AA ones though?
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The AAA ones leak too. Used to be a firm believer in the coppertop, but have since switched to the "bunny". No leaks with them so far.Only seems to be the AA ones though?
Me too, even had them leak in the unopened packaging.The AAA ones leak too. Used to be a firm believer in the coppertop, but have since switched to the "bunny". No leaks with them so far.
Duracell alkaline, AA & AAA. Had more than a couple leak in their original packaging, whilst stored in a cool dark cupboard, along with ruined flashlights.Cheaply made batteries that leak? The Chinese ones at The Dollar Store are leaking in their packages before being used.
You might want to think about getting 8 amps out of a D cell. Apparently you connected an ammeter right across the cell?
D Cell Data Sheet
The mini flashlights operate from 3 AAA cells. The voltage from 2 D cells will be marginal at the start and quickly be too low to illuminate the LEDs.
View attachment 124344
I converted a lightbulb to run from a USB powerbank.
I opened up the lamp and found that the LEDs were 6V ones (actually 2 in series in each package), in a series string to make the voltage quite high. I put link wires so that they were in parallel, with half in reverse. Sadly, I could then only run half of the LEDs like that.
I used a boost circuit, modified to limit the current (See this post and the ones after it) to drive the LEDs and the supply for that came from the power bank.
It was simple, in that I didn't have to design the boost circuit to run from anything other than 5 V, and the charging and low-voltage cut-off was taken care of. It wasn't too inefficient, as there was no transformer needed, no boosting to higher voltages. However, it wasn't very efficient as it had two boost circuits (the one in the power bank and the constant current one, while a more optimised design could have boosted from the lithium battery directly to the LEDs.