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You can replace lead acid battery with similar capacity NIMH battery.
Vibration should not be a problem.
The only one thing you have to be aware of is that Ni-MH batteries can be damaged from heat due to overcharging, but this is easily avoided by using a high quality, microprocessor controlled battery charger or a charger designed for Ni-MH batteries and charging as directed by the manufacturer..
Regards,
IanP
Take care that the original way to recharge the lead acid batteries is not working properly with the NI-MH batteries too.
You risk to make an explosion due to surcharge of the batteries connected.
The recharging of the NI-MH batteries is something quite complicated, involving current, temperature, voltage and time.
If You are not recharging the batteries in your circuit I don't see any problem.
About vibrations, tested on one applicatoin until 8G random without any problem.
is lead acid sensitive to vibration? My brand new lead acid cell for a scooter went dead after 3 weeks. I recharge after every use and never discharged it completely.
Probably the only thing I would worry about is the charging. Make sure you use a NiMH charger, since the algorithm is different. This is really important, that the batteries be charged correctly.
Mixing old cells with new ones is always a bad idea, regardless of chemistry.
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