Charger for restoring battery capacity. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Many batteries (for example, KBS-0,5), whose capacity is not lower than 0,3 ... 0,5 of the nominal, can be restored by charging with an asymmetric current. To identify batteries suitable for recovery, determine the change in their voltage under a load of 10 ohms, which should not exceed 0,2 V.
When restoring batteries, it is necessary to maintain the ratio of the charge current to the discharge current Iz / Ip = 6 with the ratio of the discharge time to the charge time tp / tz = 1,5. You can restore batteries up to 10 or more times, each time charging the cell up to 1,7-2,1V. Charging time can reach 10...15 hours.
The voltage on the secondary winding of the transformer must be 6,5 ... 7 V. Rectifier diode type D226, D237. To stabilize the charging current, you can use a 3,5 V incandescent bulb connected in series with the battery. When restoring elements with a voltage of about 2 V, a voltage of 2,3 ... 2,5 V should be maintained on the secondary winding of the transformer.
Instead of a resistor shunting the rectifier diode, you can use a capacitor with a capacitance of 10,0 uF with a voltage of 10 ... 15 V.
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