Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. johnyradio

    Li-ion Pcb Charger Not Working

    Ok, success! I managed to discharge and recharge 4 cells. To discharge, i drove 3 computer fans in parallel off the pack. The controller properly turned off at about 3.5 V to prevent over-discharge. That's a pretty high cutoff, i've read the cells can be discharged to 2.5 V without problem...
  2. johnyradio

    Overcharged Protected Li-Ion?

    I might be wrong, but i don't think they ever put the pcb inside the batteries. Just chemicals :) Anyway, today i had success charging and recharging these batteries, with an EXTERNAL charger. They appear to work as li-ions, without any explosions (even tho their protection pcb's are phony)...
  3. johnyradio

    Overcharged Protected Li-Ion?

    no, i'm not here to politicize, i'm here to get technical answers to technical questions. The photo of the pcb with parts, in case you did not bother to visit the link i provided, is a generic photo from the link i provided, showing how round pcb's are connected to protected cells. I provided...
  4. johnyradio

    Li-ion Pcb Charger Not Working

    i'm using 19v. the datasheet says "Wide operating voltage range 2 V to 24 V"
  5. johnyradio

    Overcharged Protected Li-Ion?

    how do you cut open a pcb? as i said, the pcb's on these batteries are identical to the pcb's in the listing of fake pcb's. Look at the photo. There are no components on the pcb. yes, i don't know why these chinese producers bother, when it seems it would be about the same cost and effort to...
  6. johnyradio

    Overcharged Protected Li-Ion?

    sorry, i don't follow you. This battery has a dummy pcb, just as shown in the links above. There are no fets. What do you mean? what's a shorting run? there are no components on these pcb's, just blanks. i did not say i wrote that article. i'm guessing english is not your first language? thx...
  7. johnyradio

    Overcharged Protected Li-Ion?

    there's no fet or diode, only the chip, but as i explained above, the chip is fake. there is no load.
  8. johnyradio

    Li-ion Pcb Charger Not Working

    The product page says: "Input volt (between B+ / B- VSS-0.3~VSS+26 V" see op
  9. johnyradio

    Overcharged Protected Li-Ion?

    ha, the vendor just gave me a full refund, when i asked why it charged past 4.2 v. He said "occasional bad battery!". what the....? i found this "false plates without any protection function". They are identical to the plates on the bottoms of these batteries. http://bit.ly/1dfEL0K Question...
  10. johnyradio

    Overcharged Protected Li-Ion?

    link to full explanation and more pix: http://www.lygte-info.dk/info/battery%20protection%20UK.html
  11. johnyradio

    Overcharged Protected Li-Ion?

    this is how they are assembled:
  12. johnyradio

    Overcharged Protected Li-Ion?

    Ok, i know you guys are going to laugh at me for even attmpting to do this, but here goes: i purchased this battery. from a us-based vendor. http://r.ebay.com/TNTDiK i checked the battery voltages on delivery. All were about 3.7 volts. Good sign. i peeled away the base of one of the...
  13. johnyradio

    Li-ion Pcb Charger Not Working

    it's the 8254AA http://www.sii-ic.com/en/semicon/datasheets/power-management-ic/lithium-ion-battery-protection-ic/s-8254a/ http://datasheet.sii-ic.com/en/battery_protection/S8254A_E.pdf
  14. johnyradio

    Li-ion Pcb Charger Not Working

    how do you know it requires 24V? the chip is one of: S-8243A/B S-8254A S-8204A S-8204B S-8225A S-8225B S-8205A/B (trying to determine which) datasheets are here: http://www.sii-ic.com/en/semicon/products/power-management-ic/lithium-ion-battery-protection-ic/
  15. johnyradio

    Li-ion Pcb Charger Not Working

    I'm trying to charge 4 x #18650 4.2V 4.5Ah Li-Ion batteries. Like these: http://r.ebay.com/zu9OjA i'm using this charger: http://r.ebay.com/6hk1Op This charger does not appear to be working. Surely my own error. When i charge some good 18650's (not full, but have at least 3V charge), i do not...

Part and Inventory Search

Back
Top