If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#14
|
|||
|
|||
LiFePO4 chargers
On Wednesday, November 14, 2018 at 2:56:35 PM UTC-5, kinsell wrote:
On 11/14/18 9:03 AM, moshe... wrote: On Tuesday, November 13, 2018 at 11:11:52 PM UTC-5, kinsell wrote: On 11/13/18 6:08 PM, bruce... wrote: Mark, When K2 was fairly new on the market I contacted them asking if Battery Tender Jr. is okay and safe, they replied that it is perfectly okay and nearly the same as their charger. I also contacted Battery Tender Jr. with the reverse question and they said the BTJr is fine for LiFePO4. I used the BTJr for years on my K2 with no issues. They're about $25 on internet sites. Have you measured the amount of charge you're getting into the K2's? It will be considerably less than the rated amount due to using a lead-acid charger. Also, if K2 has cell balancing capability, it won't be used because your Battery Tender doesn't put out enough voltage to make it work. Many simple lead-acid chargers reach up to around 14.2-14.8 volts. That voltage would suffice to charge an LFP battery to well above 90% capacity if it stays there for a while. If it quickly shifts to "float" at 13.5V or so then it won't do well in charging LFP. So simpler is better in this case. Measure what your charger does. And disconnect it after several hours, don't leave it on "float". Hate to break this to you, but at $24, the Battery Tender Junior is one of the cheapest chargers on the market, and is fully featured with a float mode. 14.2 volts wouldn't begin to charge an LFP to "well over 90%" as you claim. If you found a charger that delivers 14.8 volts under load, then it would overcharge an SLA and would be considered defective. If you're going to spend big bucks for an LFP, you ought to get a proper charger for it. Still waiting to hear just how much charge the K2's got in them from a BTJ. -Dave That's the conventional wisdom, but see experimental results he https://www.powerstream.com/lithium-...ge-voltage.htm - well above 90% capacity even at a bit lower than 14V! A cheap dumb 14.x volt fixed-voltage source with limited current output (and perhaps aided by the battery's BMS) would charge an LFP just fine. I'm not saying that's the ideal charger, but in a pinch it would work well enough. I am not happy with the several chargers I have that push SLAs well above 14V (even above 15V), but they may be handy for LFPs. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Battery Chargers | Stan Amyett | Soaring | 2 | March 12th 04 05:27 AM |
Solar Battery Chargers | Jay Honeck | Piloting | 32 | February 22nd 04 11:17 PM |
Battery Chargers | Mike Rapoport | Owning | 11 | December 2nd 03 11:55 PM |
Rechargable AA batteries and chargers | TripFarmer | General Aviation | 2 | October 17th 03 06:34 PM |
Rechargable batteries and chargers....... | TripFarmer | Products | 2 | October 17th 03 06:31 PM |