I've manage to restore several Pb batteries from AIWA. Now I'm testing charging and endurance. If my method is sucsesful i will made revival tutorial and post here.
Now I make test with PB batteries. I't turns out this batteries with manufacturing date around 90's have great chance to be able to charge with very decent capacity. Compared with NiMH and LiPo -Pb batteries is simple but very reliable sources of energy. You can't restore old LiPo or NiMH! Only 1 of 4 was busted for good. Now I have 3 working Pb batteries. Soon I will tell you more. Behold collect your Pb batteries and prepare them for new life
Everything depends on cell condition. Some are better than others but only around 30% of capacity are back in cell best case scenario. I fix 3 of 5 cell and of 600 mAh cell recover only 150 mAh, of 300mAh cell-100 mAh- Steps are: 1.Dissemble (from terminal side) 2.Open rubber valve/cap 3.Inject distilled water inside to flush inside 4.Make concentrate mix of sodium-bicarbonate (Baking powder) and distilled water,dissolve ad inject good amount inside, wait 2 hour(this will dissolve sulfate inside). 5.Repeat step 3 6.Drain excessive amount of water 7.Wear protective class and gloves. Take electrolyte with Syringe from some lead -acid battery (2ml) 8.Wear protective class and gloves. Inject amount in battery cell to fill good and drain it 9.Charge battery with electronic charger(I use IMAX B6) program is pb 2V 1 Cell with 0.1 current. First charging with open cap and vertical. If current is high than 0.1A-0.3A will gas a lot (if voltage is low and charger wont start-then use 2v charger directly to +and- for 40-60 seconds this way voltage will rise enough). Try again with IMAX B6. Measure with multi-meter to verify. 10.Wait to charge- if is good it will take some time,if is not good it will finish charging after several second 11.Measure (U) with DC multi-meter if is around 2.00-2.40 volts is good if is around 1.5 not good 12.Clear and close rubber cap and paper ring, assemble battery 13.Test with walkman if is good will last around 90min my best case 14.Enjoy and say Thanks to me
Thank you very much for sharing those essential skills! Definitely worth a try once I can find some electrolyte and an Imax B6 ;-)
Hello Sanchos, Good job. I tried the same 8-10 years ago. My method was different. I used only destillated water and for short time a 9V battery as charging source (vertical position rubber cap off). After that the standard Aiwa charger. My idea behind was that increased gas will result most of the sulfate peal off from the eletrodes dissolve with the water and become electrolite again. The result was the same some battery remain dead but some come to live again with limited capacity. I could rejuvenate a bigger 12V lead-acid battery of an Aiwa portable MD player/recorder. I didn't publish it as the result was less than I expected. My hope was more optimistic than the reality But anyway some 30 years old battery still can work. I had the same result with Sony NiMH battery, but only if the battery was not used at all. (Brand new never used walkman with all the accessories and papers) Best regards,
Hello again i was able to replace the two thin led plates with new ones from china flash light and now PB-4S is like new.
This is amazing to read! I love the style of the older batteries and unfortunately I also have a few dead batteries. For those of us not so experienced to follow the instructions, I recently posted a cost-effective solution in another thread. Total cost: approximately 6 euros and a can of soda. Or beans. This come down to replacing the lead-acid battery with 2 smaller gumsticks from a Siemens Gigaset E40 battery. I cut of the original wires and connector, but left the lead soldered to the (-) of one of the batteries attached. It provides a large contact surface when batteries are inserted and the door is closed. These replacement batteries are widely available, for instance Amazon. Details, see: http://stereo2go.com/forums/posts/53277/ I used part of a can (cut and folded) for the ground (-) that wraps around the batteries top to bottom.
