I have an existing internal Li-Ion camera battery which is 7.4v 2200 mAh, and although I can make an external Li-Ion battery pack of 7.4v 9600mAh without a problem, I would be interested in also making this external battery using a SLA (sealed lead acid) battery as an alternative. When the camera is being powered via an AC adapter that came with the camera, the rating of the AC adapter is 8.4v, 3 A.
If I connect the LM317 voltage regulator (https://www.electro-tech-online.com/custompdfs/2010/08/LM317M-DPDF.pdf) to the 12 (7 AH or other size) SLA, it seems that the LM317 can not handle this amount of current, without generating excessive heat.
Suggestions are most appreciated to drop the 12 volts to the 8.4 needed, with minimizing the losses, but without having to use a complicated or expensive circuit.
I have also seen 4 volt SLA batteries which could be used in series to supply a straight 8 volts without having to use a regulator, although they are not as common as the 12 volt SLA bateries.
Michael
If I connect the LM317 voltage regulator (https://www.electro-tech-online.com/custompdfs/2010/08/LM317M-DPDF.pdf) to the 12 (7 AH or other size) SLA, it seems that the LM317 can not handle this amount of current, without generating excessive heat.
Suggestions are most appreciated to drop the 12 volts to the 8.4 needed, with minimizing the losses, but without having to use a complicated or expensive circuit.
I have also seen 4 volt SLA batteries which could be used in series to supply a straight 8 volts without having to use a regulator, although they are not as common as the 12 volt SLA bateries.
Michael