Which battery is suitable for the LED lamp?

Tatyana asks:
I have a battery-powered LED lamp (SE-4.0 4V4.0AH / 20HR, 100 mmx45mmx70mm). The battery no longer holds a charge. I can not find the same battery, I found only one option through China - the characteristics of 4v4AH, but with a size of 100x45x45. 1) will it fit? 2) and 6v does not fit? thank
The answer to the question:
Hello! If the voltage (4V) is the same then it will do. Capacity (4AH) can be more or less - battery life depends on it. But on 6V, it’s not a fact that it’s suitable - it all depends on how the power supply circuit of the LEDs is made, if it is from a pulse driver, it should come up, if through resistors, then the LEDs will burn out most likely.
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