Electronics > Beginners

Battery charger testing

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David Hess:

--- Quote from: maukka on August 23, 2019, 10:41:39 am ---
--- Quote from: radiolistener on August 23, 2019, 08:35:37 am ---14.4 V looks like lead-acid battery. I think this is not a good idea to use Li-Ion charge for lead-acid battery.
--- End quote ---

14.4V would indicate it's meant for LiFePo4 batteries, which can be charged up to 14.6V, but provide almost all of the capacity anywhere from 13.8V upwards.
--- End quote ---

This is what I was going to post and 4 cell LiFePO4 batteries are commonly used as drop in replacements for 12 volt lead-acid batteries.

As to the original problem, try decoupling the charger from the electronic load by installing a large electrolytic capacitor at the charger's output.  Unless the electronic load is designed to simulate a battery, it may not provide a low enough AC impedance.

thinkfat:
Multi quadrant power supply is what you want to use. Or a Communications power supply like a HP66309D.

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