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Rechargeable Battery Checker

Measure capacity by controlled discharge

Rechargeable Battery Checker
The author’s rechargeable battery collection comprises a large number of cells of various types, ages and states. Surely he cannot be the only person who would find a ‘capability meter’ for batteries of great value and interest!
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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 = 470(
R2,R4,R5,R10 = 1kOhm
R3 = 10kOhm
R6–R9 = 1( 1% 0.5W
P1 = 20kOhm trimpot, horizontal
C1,C2,C3 = 100nF
C4,C6 = 10µF 10V, radial, 2mm/5mm pitch
C5 = 100µF 10V, radial, 2.5mm/6 mm pitch
C7,C8 = 22pF
D1,D2 = BAT43
D3 = 1N4001
D4 = LED, red, 3mm
T1 = IRL3803
LCD1 = TC1602C
IC1 = ATmega88-20, programmed, Elektor # 120447-41
IC2 = LM285-2V5
IC3 = 7805
LCD1 = LC display 2x16, e.g. Elektor # 120061-71
K1 = 10-pin (2x5) pinheader, 0.1‘‘ pitch
K2,K4 = PCB terminal block, 0.2‘‘ pitch
K3 = 3-way receptacle, 0.1’’ pitch
JP1–JP4 = 3-pin pinheader, 0.1’’ pitch
S1 = pushbutton
PCB # 120447-1
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