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It will not make too much if a diference. mAh is the amount of power the battery can have have, the higher the mAh the longer the battery can last/hold it's charge. So do use that battery and it will be fine.
Hello. It would be the 14500 600mAh Lithium-Ion Rechargeable Battery.
Yes, our 14500 batteries are the same as the 14500s in all of our units.
SolarCentre 14500 600mAh Lithium-Ion Rechargeable Battery
£5.99