Author Topic: charging two diffrent types batteries with one charger  (Read 9164 times)

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Offline aaa3aTopic starter

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charging two diffrent types batteries with one charger
« on: March 09, 2020, 06:10:28 AM »
i have a robot work with two batteries one for the microcontroller and low consuming power circuits (2x 3.7v 18650 battery in series with total 7.4v )
and one for the motor and power sucker stuff (6v/4ah sealed lead acid battery)

i've wired it as shows in attachmed  photo
i used toggel switch to switch between operation mode and charging mode

my problem is the 7.4 battery charge well but the lead acid still 2.4v
i left them to charge for 12 hours

the lead acid battery charging alone very well to 6.9v

is there a solution for this system and what is the right way to charge the 2 batteries


Offline bdk6

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Re: charging two diffrent types batteries with one charger
« Reply #1 on: November 24, 2020, 06:16:00 AM »
Every type of battery has different charging requirements.  Lead Acid and LiPo are VERY different.  Each should have a charger especially designed for it.
You don't state what type of "charger" you are using.  I have a feeling it isn't intended for either type of battery.
LiPo batteries are subject to catch fire or even explode if charged improperly.  Lead acid is less dangerous but can still be damaged or destroyed.
I HIGHLY recommend you buy appropriate chargers designed for each type and use ONLY those.

There is a great deal of information on batteries and charging here: