Some facts about mode-hopping.

ElektroFreak said:

The two main causes of mode-hopping are temperature and unstable power sources (like low batteries or using HiMH/NiCd rechargeable batteries in a laser pointer).

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What is the difference between using a NiMH and a Lithuim / Li-ion, and it's impact on mode hopping ?

Brendan said:

What is the difference between using a NiMH and a Lithuim / Li-ion, and it's impact on mode hopping ?

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It's the same as having a dead primary or rechargeable lithium ion. NiMH and NiCd are lower voltage batteries. If you have a driver that's wanting to see the voltage of a primary or Li-ion battey, using NiMH or NiCd's will be just like using dead batteries. They won't have the voltage the driver wants, therefore the pump will be underpowered and unstable.