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Description: A really cool rechargeable Lithium Ion coin cell battery. The battery is rated for 3.6V @ 110mAh - a great way to run a small embedded project for hours. This battery is a standard CR2450 battery size.

Dimensions: 24.5x5.2mm

Weight: 6.4g

Documents:

Replaces: PRT-08818

Comments 27 comments

  • Here’s an convenient charger for this battery. http://www.theledart.com/blog/?p=1917

  • Can you guys post a datasheet? I’d like to know the maximum charge and discharge current.
    Can you guys get the thinner 3 mm version of this too?

    • A rule of thumb for most lithium batteries is that you should be safe with anything around 1/3 C or lower for charging and discharging. (C being the amp-hour rating of the battery.) So limit the current in or out of this one to about 37 mA or so. I’d recommend ½ C (55 mA) as a maximum. Any more and the overall charge discharge cycle life of the battery will suffer.
      A typical charger will first check the battery condition by using a low value test current, then charge for a couple hours or more at a constant current until the voltage reaches the design limit (typically 4.2 Volts). At that point the voltage is held constant and the current is monitored. When it falls to 10% of the main charge current the current is turned off. You must not trickle charge lithium batteries. And usually the temperature of the battery is monitored while charging.
      For SFE’s basic charger sku: PRT-10217 you’d want to change R4 from 2 kOhms to about 30 kOhms.
      This is for plain vanilla lithium batteries.
      There are batteries for RC cars and copters and such that can handle 10C, 20C or more, and folks are working on batteries for cars that can be charged at 100C (essentially taking the same amount of time it takes to fill a gas tank).

  • Talking about coin. I remember when Canada eliminated their Canadian Mint. The last penny itself was actually minted last May. The Canadian penny had been in circulation for more than a century and a half. From now on, all cash transactions will be rounded up or down to the nearest five cents.

  • If I’m reading this datasheet right, we charge these at 4.2V, even though they operate at 3.6V nominally. Is this correct? It’s making me a bit uneasy.

  • ok I couldn’t find and answer for this here. what sparkfun chargers would work with this battery ? if its the MCP73831T then do i need to set the charger from 500mA to 100mA ?

  • does anyone make a vertical coin cell holder for this battery?

  • I am looking for reference design that can charge both rechargeable coin-cell and LiIon/LiPo battery. I saw a design by Jay about 6 months ago. Can I use this design for both rechargeable coin cell and LiPo (not in parallel or concurently)?

  • I designed a charger for these if anyone is interested. You can check it out and download the files at my site. I’m not set up for commerce, but can sell you one if you email me. Have 90 bare boards if you want to solder them yourself.

    • That link is broken, but I believe this is the same post: http://chasingtrons.com/main/2012/3/26/cr2450-coin-cell-charger.html

  • So which is the best way to recharge this battery? I own an PRT-10161.
    Thank y

  • hi, I just got 2 of these, my question is, do I have to charge them before the first use or do they come already charged like Lead-Acid batteries?

    • I’m not fully sure but most Li-Pos come with a “Storage Charge” of about 70% of the battery’s capacity.

  • Can this be used in the Costco ‘wind-up’ flashlight? the one on it has died.

  • Is there any data sheet available for this product? And what battery holder will be best for these batteries?

    • We don’t have a data sheet for the battery specifically, but here are the basic characteristics:
      LIR2450 Li-ion battery
      Norminal voltage: 3.6V
      Norminal capacity: 160mAh
      Approx weight: 6.5g
      Wide temperature range from -20C to +60C

  • It would be useful for me (and I suspect most average hobbyists) if Sparkfun sold a battery holder for this part that doesn’t need to have a circuit board attached to it in order to work. When I’m prototyping I use wires- lots of wires…
    Of course, a break-out board for PRT-08863 would work too.

  • I am not an expert by any means, but I built a circuit with the battery this one replaces and a MAX1555 charger running an Atmega328. The intention was to ensure the Atmega kept running during occasional power outages, in order to correctly preserve time (RTC design with async Timer2 and 32.768kHz crystal)
    The circuit only ran for six months (I replaced it with a new design that does away with the rechargeable batt), and it ran extremely well. Along this time it had at least one three-hour power outage every day. But it being so little time, I can’t tell whether the charger chip wrecked the battery’s lifecycle or something.
    Prior to assembling my circuit, I did some tests on a breadboard (holding the battery between right-angle headers and using a SOT-23 to DIP adapter for the charger), and also got good results re charging time, voltages, etc. (none of which, I admit, I checked over the final PCB)
    Important: I only used the USB input of the MAX1555, never the DC one.

    • My application is similar to yours, rjimenez, and like you I am concerned with damaging the cell long-term. My impression is that lithium ion cells are happiest when they are not under continuous charge. If they are allowed to ‘relax’ to about 3.9 or 4.0V they seem to last longer than if they are held at 4.2V for long stretches of time (I’d appreciate CaptainKirk’s comment on that … wait, did I really just say that ?) I am going to set up a little testbed where I have extra diodes coming from the MAX1555 GND to ground and from the BAT pin to the cell under charge. I figure if the Vf’s are different I can detune the max charging voltage by 0.1 or 0.2V.

  • Can this beauty be charged with LiPoly Charger sku: PRT-00726 ??.
    This charger is based on the MAX1555 instead of the MCP73831T, as does the sku: PRT-10217.
    In my opinion it looks as it doesn’t, because the MAX1555 says it is for Lipo only, and MCP73831T is for both Lipo and Li-Ion.
    It is a bit confusing, because the MAX1555 charger appears in the “Related Products” section of this button cell, but the Sparkfun recommendation is for the MCP73831T instead (see other comments).
    Anyway, an expert statement on this would be well received.

    • The MAX1555 has a minimum of 100 mA charge current, or almost a 1C charge rate. You could do it, but the battery life will probably suffer. I don’t see any easy way to reduce the current.

  • this could be great on the arduino fio.

  • Any idea why this one is 110mAh and the old one with the same physical size was 200mAh?

    • all batteries can range in capacities. their energy density can vary quite a bit for the same size package. for instance, compare an energizer or duracell battery to the cheapest off-brand you can find. they are both AA, but the ‘better’ ones have more capacity.

      • i’d agree with Member30927, it doesn’t seem to make sense that you’re selling a worse battery (from your description) for the same price because you got a better supplier ? What up, thx!

  • nice! ill buy one asap … Hope it stays in stock!


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