I checked a typical datasheet for the LM 2596 and the efficiency from ~12.5V to 3.0V is about 74% so pretty low but not unreasonable given the 'turndown' ratio from the input to the output voltageĪ higher capacity (much higher) power supply you might want to consider (I have not purchased or used this one so cannot comment on its performance) Apparently this allows up to 3A operation. Note: I added a small heat sink for the LM2896 chip. Usually I will be charging at 200mA or possibly at 500mA as I prefer to extend the life of the cells by treating them well so this power supply should be suitable. Another consideration is that the maximum current requirement will be demanded when 4 batteries are in the charger and are charging at the highest rate each (700mA each). However, it is close to the rated output (3A), so you may want to choose something with a bit more capacity (amperage). I had a power supply lying around which I'd bought on e-bay and decided to use it. Note: The power supply is terminated with a 2.1mm 'bullet' style connector (see photo) As I wanted to charge my batteries from a 12VDC solar/battery supply I needed to find a suitable alternative substitute power supply. The BL700 is supplied with a mains AC power supply that is rated 3V 2.8a This is quite an unusual (high) amperage supply at such a low voltage.
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