Recent content by 45/70

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  1. 45/70

    Safe chemistry LiMN 3.7V rechargeable batteries?

    Hello cy. You brought me back from the dead! :) Determining Li-Ion cell chemistry by voltage measurement is a bit difficult. The various LiCo as well as LiMn cells will all charge up to pretty close to whatever voltage at which they are charged (ie. the CV voltage of the charger used). LiFe...
  2. 45/70

    Review of / Measurement on Xtar MP2 charger

    Hi rebar. I've been out of the loop for a few months but as I said above, most any charger that is setup for charging LiFePO4 cells will probably work OK. As long as the actual maximum charging circuit voltage is in the 3.6-3.8 Volt range, damage will be minimal, if any, when charging IFR...
  3. 45/70

    Energizer Advanced Lithium cells - FAIL

    Hi emp, and welcome to CPF!:thumbsup: As Yamabushi said, there is no such thing as a lithium-ion primary cell. All Li-Ion cells are rechargeable, and thus "secondary" cells. This is largely due to the fact that lithium cells and lithium-ion cells are two totally different chemistries. Li-Ion...
  4. 45/70

    A few questions about my new 4Sevens Single-Bay charger...

    Hi Swedpat. It sounds like the 17670 cells are not making proper contact with the charger's contacts. The cells charge in the Pila, so that almost has to be the problem. It's worth investigating, anyway. I can't think of any other reason they would not charge. Visually check and see if the...
  5. 45/70

    Review of / Measurement on Xtar SP2 charger

    Hi Fred. I was referring to how the WP6 II, as well as most of the rest of XTAR's chargers, apply the charging current in pulses, rather than a constant current. So far, the SP2 is the only one that doesn't. I wasn't going to bring it up again, but a few posts back HKJ stated...... This is...
  6. 45/70

    Review of / Measurement on Xtar SP2 charger

    That's great that you managed to "fix" your SP2, Iron. I guess "you get what you pay for" applies to QC, as much as anything else, when it comes to the less expensive chargers. I wish XTAR would incorporate the SP2's electronics (and thus the algorithm) into their WP6 version. I've been...
  7. 45/70

    CAN A HOBBY CHARGER DO A C9000 BREAK-IN?

    Hi Tata. The voltage reading I'm referring to is the voltage in the upper right corner of the 106B+'s display when the "forming charge" is started. I started a forming charge on an old La Crosse 2000mAh AA cell. The capacity was set at 2A. While this cell was basically discharged, the...
  8. 45/70

    Big battery test

    Hi pimaxc. This same test was brought up just a few days ago, by Mr Happy. Perhaps a thread merger is in order? I use so few primary cells anymore that I really don't have any thoughts on the subject, myself. Interesting test though. Dave
  9. 45/70

    CAN A HOBBY CHARGER DO A C9000 BREAK-IN?

    Hi Tata. Sorry, I meant to respond to this some time ago, but forgot. Been really sick with the worst cold I've had in years, among other things. I asked what voltage you are seeing when you see the charger is only charging at 4.5A, when you think it should be charging at 9.5A. The voltage...
  10. 45/70

    Is there any danger to charging zero-voltage Lithium Ions?

    Good points, Mike. road was reading 0.3 Volt, later in his attempts to charge the cells in question though. This indicates to me that these are unprotected cells. Also, while a protection circuit will generally stop discharge at somewhere between 2.50 and 2.75 Volts, once the circuit is...
  11. 45/70

    Can leaking NiMH cause a battery tray to melt with heat

    Hi crazy and welcome to CPF! :thumbsup: It's hard to tell from the pictures, but it would appear that the pack was shorted out, at some point. It looks like the insulation is burnt off the wires, as well. Perhaps the wires were pinched? 8 AA NiMh cells are more than capable of generating...
  12. 45/70

    Which Rechargable CR2 Batteries and Charger are Safe to use with Streamlight TLR-4?

    Welcome to CPF, FlashlightJedi.:thumbsup: I'll go along with echo in this application. Batteries in weapon mounted lights are basically "beaten to death". I wouldn't even consider Li-Ion cells for such use. The difference in voltage, of course, may also be an issue. If it were me, I'd stay...
  13. 45/70

    Car battery VS deep cycle battery.

    Just to touch on something that wasn't directly addressed, the difference between an automotive starting battery and a conventional, deep cycle marine type battery, are the thickness and number of plates. Comparing similar Ah auto and deep cycle batteries, auto batteries have many more plates...
  14. 45/70

    Is there any danger to charging zero-voltage Lithium Ions?

    Just to add a bit to what BG said, the problem with over discharged cells is that the components within the cell can undergo physical changes that are permanent, and non-reversible. Most of this degradation simply results in an under performing cell. The copper shunts that form however...
  15. 45/70

    Pila IBC Charger vs MAHA C9000 - Quality Rant

    The reason I'm familiar with the spring/slider setup and have actually measured the resistance in this type setup, is because of the NiCd chargers I have adapted for use in charging Li-Ion cells with a hobby charger. These chargers were completely gutted of transformer, wiring etc. and rewired...
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