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shared battery charger with diodes

mrhford

Sep 1, 2022
2
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Sep 1, 2022
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Can I use 1 charger to charge several SLA 7 Ahr batteries at once (sorta parallel) with each (+) or (-) using a diode to stop leeching?
( 500 ma output supply on a 24 hr timer set to power up 30 minutes per day, to just keeep the batteries from self discharging)
I have a finite number of these and hate to see them died while out of rotation.
Henry
 

kellys_eye

Jun 25, 2010
5,095
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Jun 25, 2010
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5,095
That's called 'split diode charging' and is a 'standard technique'. Just ensure the diodes are suitably rated for the charging current and that the charger can compensate for the 0.5-0.8V voltage drop the diode introduces i.e. adjust the charger output slightly higher if possible.
 

mrhford

Sep 1, 2022
2
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Sep 1, 2022
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Thanks, the P/S is an HP printer SMPS 15dc out A 580ma with a 1n4001 it shows 13.8v output. If i charge 4 in parallel the PS should survive?
 

skenn_ie

Sep 7, 2009
33
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Sep 7, 2009
Messages
33
I suggest using "ideal" diodes. A 2-component circuit readily available as modules on ebay.
 

alexsmith468547

Oct 5, 2022
1
Joined
Oct 5, 2022
Messages
1
What is the purpose of diodes on a battery charger?


A split-charge diode is an electronic device used to enable simultaneous charging of multiple batteries from one power source. The device prevents current from flowing from one battery to another while enabling the batteries to be continuously connected.
 
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