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Simple question: Is low amperage good for battery? Is it decrease wear level? Ex: we have battery with 2A recommended. Will it be better to charge it with 1A?

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Anything that reduces temperature rise <10 deg C results in reduced aging rates but longer charge times. So it is a tradeoff between life expectancy and Amps per Amp hour capacity. e.g. using a C/10 battery in C/5 mode improves life expectancy by x% (ref needed) if that reduces temp rise.

I^2*ESR=Pd then Pd*Rja = T_rise

  • The charge or discharge current squared times the internal Effective Series Resistance , ESR = Power dissipated, Pd. Then the thermal resistance from internal cell junction to ambient, Rja, determines the temperature rise of the cell chemistry.
  • Arrhenius Law says "for every approx 10 deg C rise, reaction rate doubles" which means life expectancy is reduced by 50% ( for the duty cycle at that temperature)
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  • \$\begingroup\$ so the question becomes, how much is waiting worth to you if you have spares? to get a little more charge cycles out of your battery. \$\endgroup\$ Sep 22, 2016 at 16:02
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Usually, yes. That mostly depends on the particular battery chemistry, be sure to consult its datasheet. For NiMH it's a different matter, since the good chargers there use delta-V overcharging detection, which gets more unreliable if the charging current is lowered.

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