7Ah LiFePo4 Deep Cycle Lithium Battery $42.50 + Delivery (Or Free Pickup) @ Rockby (Clayton, VIC)

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oz-dxer on 21/08/2019 - 11:16 rockby.com.au (544 clicks)
Last edited 21/08/2019 - 11:24 by 1 other user

Not really a consumer product but for those who need one will know it is about 25% less than many simialar offerings around, even ones on ebay etc.
Nice and lightweight, only 760g, as compared to a standard SLA battery. Great for that hiking or camping trip away.

Device:CB-7-12-15
** Same size as Lead Acid **
Voltage: 12.8V
Nom. Discharge Rate:5A
* LiFePo4 Lithium Iron Phosphate
* Built in adv.BMS
* 2000+Cycles
Weight:760g
Size(LDHmm): 150x67x92
Mfg:Solarking
* NON-Starting Battery *

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  Sunny84 on 21/08/2019 - 11:21

  Can these be used in applications where a normal SLA battery would be used i.e UPS, alarm systems etc. without needing a special charging circuit?

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    0jay on 21/08/2019 - 11:24

    Depends on the manufacturer as to whether their BMS allows for regular lead acid chargers (it’s more or less convention so almost certainly it does) but the caveat is whatever charger you use cannot utilise a pulse charge program.

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    stumo on 21/08/2019 - 12:18

    The biggest problem will be the float voltage. SLA need about 13.8V for continuous float charging after they are fully charged. LFP need zero.

    LFP can be floated at around 13.3V, which is their nominal resting voltage, ie. no actual charging taking place. But ideally they should be disconnected from the charger once charged.

    If you float LFP any higher than their resting voltage then they will slowly keep charging until they are totally full, and then they start plating their electrodes and causing permannent damage which means less capacity over time.

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      0jay on 21/08/2019 - 12:46

      I think you’ll find this is taken care of by a good BMS as well.

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        stumo on 21/08/2019 - 13:15

        Not on the kind of BMS you get in packs like these.

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          0jay on 21/08/2019 - 13:30

          @stumo: These BMS’re supposed to prevent overcharging (and lifpo don’t need a float charge), though I’ve no idea about this particular make.

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            stumo on 21/08/2019 - 14:08

            @0jay: Overcharge via float is different to the kind of overcharge these cheap BMSs monitor. They will cut off the bank if a cell voltage goes above a certain point. This point is the high voltage cutoff usually around 3.6V for LFP.

            It will do nothing if the pack is floated and will happily let the cells plate themselves at a lower constant voltage.

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              0jay on 21/08/2019 - 14:19

              @stumo: Is there an affordable auxiliary solution to this or is that a pretty high end proposition?

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                stumo on 21/08/2019 - 15:11

                @0jay: Not affordable. The RV industry is getting heavily into LFP house banks these days. They tend to charge a lot for fairly basic devices.

                There are some cheap DCDC chargers on eBay that will stop charging after a full charge, and/or have several adjustable voltage setpoints including float voltage. These start at about $200 for a 20A one. But you still need a BMS for cell protection either way.

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                  0jay on 21/08/2019 - 15:56

                  @stumo: Right, or go full manual. I use an IDC25 with a Hella key switch. Takes about 40 mins to topup a 50Ah every day.

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    afoveht on 21/08/2019 - 23:21

    No need in an alarm or UPS. Extra charge / discharge cycles not needed. Light weight and high energy density not really needed. Why would you want to swap over?

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  PukeyLuke on 21/08/2019 - 11:38

  +2

  Hey kids, if you want to experience what the internet used to look like go surf this website.
  It brought back fond memories of the 90's, tiny font, flashing "SPECIALS" symbols, confusing home page.
  Oh it was a wonderful experience, thanks Rockby Electronics!!

  • 

    WARvault on 21/08/2019 - 11:50

    That Angelfire Futurism a e s t h e t i c

  • 

    Addamant1 on 21/08/2019 - 12:07

    Oh my eyes, I was blind but now i can see, bright pastel colours of destiny.

  • 

    zacsg1 on 21/08/2019 - 12:08

    I love the big email icon 🤣

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  sharkfan12 on 21/08/2019 - 12:51

  Just like the old MSY website.
  When I say "old" I mean like 12 months ago. lol