K.  Walraven
About the article

Lead-Acid Battery Revitaliser

a de-sulphation device for worn out batteries

Lead-Acid Battery Revitaliser
This circuit makes it possible to do something that was previously unthinkable: reversing the effects of sulphation in tired lead-acid batteries. The circuit is also recommended for use as a conditioner for new batteries.In a recent scientific journal it was stated that 80% of lead-acid batteries eventually fail due to sulphation. This sulphation occurs due to general old age, non-ideal charge/discharge cycles or storage in a discharged state for too long. The last happens often with batteries in motorbikes and classic cars, since these have an enforced rest during the winter months. To counter this, Elektor Electronics has designed a special charger a couple of years ago, which keeps the batteries in good condition during their winter sleep.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 22kOhm
R2,R6,R7 = 4kOhm 7
R3 = 5kOhm 6
R4 = 0Ohm 33 5W
R5 = 820kOhm
R8 = 10kOhm
R9 = 2kOhm 2
C1 = 22nF
C2 = 100µF 25V radial
C3,C4 = 100nF
L1 = 10mH
L2 = 100µH 3A suppressor coil
D1 = LED
D2 = BAT85
D3 = SB560 or PBYR745
D4,D5 = BZT03 27 or P6KE 27
D6,D7 = 1N4148
D8 = LED, green (high efficiency)
D9 = LED, yellow (high efficiency)
D10 = LED, red (high efficiency)
T1 = BUZ41
IC1 = 4047
IC2 = LM339
K1 = 2-way PCB terminal block, lead pitch 7.5mm
PCB, order code 010200-1
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