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MAX1555 and Ni chemistries

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kender

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max1555

Folks,

In the past I've used MAX1555 (LDO charger for a single Li cell) with success for charging the Li-polymer batteries. Now I have a board with MAX1555, which was originally designed for Li+. I'd like to reuse the board in another project, but unfortunately, my time, budget and space constraints don't allow Li+ battery pack. What will happen, if I charge three (3) series Ni batteries with MAX1555? The nominal voltage would be +3.6V: about the same as one Li cell.

- Nick
 

max1555 solar

kender said:
...
What will happen, if I charge three (3) Ni batteries with MAX1555? The nominal voltage would be +3.6V: about the same as one Li cell.
- Nick
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Hi Nick,

this will certainly not work, as 1.2V is the quiescent voltage of a NiCd or NiMH cell. To be able to totally load such a cell, you must provide at least 1.4V per cell, some more at higher temperature.
- erikl
 

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