Recent content by Battery Guy
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LiFePO4 abuse tolerance & overall safety.
I still lurk, and check my inbox from time-to-time, but work and life commitments have kept me from jumping into the fray on CPF. Cheers, BG- Battery Guy
- Post #14
- Forum: Flashlight Electronics - Batteries Included
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The AA NiMH Performance Test Thread
You could also check out the old Introduction to Ragone Plots thread. The Energizer Ultimate Lithium and Eneloop curves intersect at a constant power discharge of 2.5 W, or approximately a 1.2C discharge rate. So you get more total energy from the lithium cells for discharge rates less than...- Battery Guy
- Post #75
- Forum: Flashlight Electronics - Batteries Included
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Is there any danger to charging zero-voltage Lithium Ions?
When a lithium-ion cell is overdischarged, the copper current collector on the negative electrode begins to dissolve. The copper ions diffuse away from the current collector, through the electrode and the separator. When you attempt to charge the cell, the copper replates as metallic copper...- Battery Guy
- Post #3
- Forum: Flashlight Electronics - Batteries Included
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NEW DURACELL ULTRA AA LITHUIM
No, the jury is not still out. You can see the difference in the AA Ragone Plot thread. Bottom line is that the Duracell has slightly higher power and the Energizer has slightly higher energy. The cross-over point is at ~1.4 W discharge, or a discharge rate of ~C/2.5. At higher power and/or...- Battery Guy
- Post #50
- Forum: Flashlight Electronics - Batteries Included
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The AA NiMH Performance Test Thread
Hi JB The Imedions have relatively high internal resistance, which results in a lower operating voltage under load. You can see this in the constant current discharge curves. This will result in lower brightness for direct drive flashlights where the bulb or LED brightness is directly...- Battery Guy
- Post #65
- Forum: Flashlight Electronics - Batteries Included
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The AA NiMH Performance Test Thread
Well, the Elite 1700s are no longer available. So those plots are a bit out of date. However, you can now get the Elite 2000 cells from cheapbatterypacks.com. But unless you need really high current (probably 3 amps or more), you are almost certainly better off with the eneloops. The Elite...- Battery Guy
- Post #59
- Forum: Flashlight Electronics - Batteries Included
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64458 6D Mag build... WOW!
The new Elite 2000 AA cells from cheapbatterypacks.com are quite good for high current applications. I have posted test results here. They are certainly going to hold up better than the Duraloops under a 12 A load. If you are blowing bulbs with the Duraloops hot off the charger, then you...- Battery Guy
- Post #37
- Forum: Incandescent Flashlights
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High Current Mag Switch Mod...Again
Guys Thanks for all of your suggestions. I am going to try the rocker switch conversion. I ordered a few different rocker switches and purchased on the the Radio Shack ones, so I hope that one of these fits with minimal need to remove plastic. I like the idea about removing anodizing around...- Battery Guy
- Post #8
- Forum: Incandescent Flashlights
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High Current Mag Switch Mod...Again
Greetings Everyone I have been dreading starting this post for a couple of weeks, but I simply cannot find a satisfactory answer to my question. Here is my dilema: I have many friends and family that love my Mag hotwire mods, most of which us the AW incan soft start switch. Several of these...- Battery Guy
- Thread
- Replies: 9
- Forum: Incandescent Flashlights
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alkaline an lithium batteries
I knew you would say that. :)- Battery Guy
- Post #12
- Forum: Flashlight Electronics - Batteries Included
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MAKITA 18V LITHIUM CELLS?
The V28 packs used to use Molicel IMR26700 cells. Those were absolutely fantastic cells, but did have relatively short cycle life. My understanding is that Molicel no longer makes the IMR26700 cells. The new M28 packs use 14 Samsung 18650 cells (they are actually labelled "INR18650") in a...- Battery Guy
- Post #9
- Forum: Flashlight Electronics - Batteries Included
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MAKITA 18V LITHIUM CELLS?
The Ryobi was easier than the Milwaukee, but the Ryobi packs use this annoying pink adhesive foam that is adhered to the ends of the cells. So you need a bit of solvent to clean them up.- Battery Guy
- Post #5
- Forum: Flashlight Electronics - Batteries Included
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MAKITA 18V LITHIUM CELLS?
fyi, I just took apart a Riobi 3 Ah 18 V battery and a Milwaukee M28 battery. The Riobi has 10 Sanyo 1500 mAh 18650 cells and the Milwaukee has 14 Samsung 1500 mAh 18650 cells. Both are great high power cells, especially for the price: $10/cell plus an hour of your time to harvest and clean up...- Battery Guy
- Post #3
- Forum: Flashlight Electronics - Batteries Included
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64458 6D Mag build... WOW!
Definitely worth it. I have not purchased any of the K2 Energy LFP cells yet and I am unlikely to have a chance to test these anytime soon. I would love to see some discharge curves for these, especially at 6 A and 10 A, as these are the discharge currents that I am usually interested in for...- Battery Guy
- Post #29
- Forum: Incandescent Flashlights
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64458 6D Mag build... WOW!
Hi FB Thanks for the info. In my search for Molicel IMR26700 cells I learned that Molicel no longer makes these. They replaced the IMR26700 with IBR26700. The original Molicel IMR26700 was pure manganese spinel, which produced a beautifully flat discharge at high voltage. The new IBR cell...- Battery Guy
- Post #26
- Forum: Incandescent Flashlights
