DM42 battery life time

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Vitasam
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DM42 battery life time

Post by Vitasam » Wed Jul 01, 2020 8:11 am

Hello,
I started to log the battery voltage, roughly once a week. Without using the calculator at all. So, switching it ON once a week.
Is this a a normal discharging curve?

Software is 3.18
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dm42_battery_chart.jpg
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Elektronika MK-61, Elektronika MK-52, HP15c LE, DM42 SN#16 FW 3.18

grsbanks
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Re: DM42 battery life time

Post by grsbanks » Wed Jul 01, 2020 8:33 am

Looks normal to me given that it drops relatively quickly from "new" but slows down after that. Also, "Rainbow" looks like a cheap Chinese brand to me. The only significant hit on Google is on Ali Baba's website, which screams "cheap Chinese junk that'll last 5 minutes if you're lucky".

See how it goes with that battery, but be prepared for the unit to fail once the battery goes below about 2.5V/2.6V because high internal resistance will kick in and reduce the voltage when you draw power from it.
There are only 10 kinds of people in the world: those who understand binary and those who do not.

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Vitasam
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Re: DM42 battery life time

Post by Vitasam » Wed Jul 01, 2020 12:28 pm

Thanks! Indeed my selection of the battery was not a best one :) But I will keep measurement for a while, then will switch to something reliable
Elektronika MK-61, Elektronika MK-52, HP15c LE, DM42 SN#16 FW 3.18

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