Search found 199 matches

by thunderheart
Aug 16 2019 5:20pm
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 49
Views: 9585

Re: Boston-Power Swing 5300 Li-ion cell test

ElectricGod wrote:
Aug 16 2019 1:14pm
What would I get for the Boston cells?
3000 cycles at 80% DOD
by thunderheart
Aug 15 2019 1:30pm
Forum: Battery Technology
Topic: Nicad vs Nimh for electric start
Replies: 17
Views: 307

Re: Nicad vs Nimh for electric start

Why not use A123 26650 LiFePo4 cells? 4S is a popular drop-in replacement for 12V starting batteries. They long-lived, high quality and out out lots of amps. You read my thoughts!!! High-drain LiFePO4 cells like A123 ANR26650M1B ( my test ) or QB26650-2500 ( my test ) are ideal for starter batterie...
by thunderheart
Aug 14 2019 6:02am
Forum: Battery Technology
Topic: Samsung 29E ver.7 (29E7) 2900mAh cell's capacity test + comparison with 29E ver.6
Replies: 9
Views: 243

Samsung 29E ver.7 (29E7) 2900mAh cell's capacity test + comparison with 29E ver.6

Less than a month ago i tested Samsung 29E v.6 which many people say is a better cell than the v.7. This time i've tested the v.7 cell and compared them to find out where is the truth. Just to remind, Samsung 29E is a 2900mAh 18650-size cell which supports discharge at up to 5.5A. https://ic.pics.li...
by thunderheart
Aug 10 2019 6:38am
Forum: Battery Technology
Topic: LG M50T Grade A high capacity 5000mAh 21700 cell's test
Replies: 8
Views: 287

Re: LG M50T Grade A high capacity 5000mAh 21700 cell's test

Thanks for sharing, Pajda! It's a very important info!
by thunderheart
Aug 09 2019 10:46am
Forum: Battery Technology
Topic: LG M50T Grade A high capacity 5000mAh 21700 cell's test
Replies: 8
Views: 287

Re: LG M50T Grade A high capacity 5000mAh 21700 cell's test

Yeah, it should be $0.4-0.5 cheaper than 50E but is that economy worth the difference in cycle life? For those who build packs for sale - yes. They need numbers. The bigger is the capacity - the higher is the price tag. But for DIY battery makers cycle life plays an important role i think.
by thunderheart
Aug 09 2019 10:18am
Forum: Battery Technology
Topic: LG M50T Grade A high capacity 5000mAh 21700 cell's test
Replies: 8
Views: 287

Re: LG M50T Grade A high capacity 5000mAh 21700 cell's test

Hi neptronix ! I'm more worried with its poor cycle life. Only 300 cycles down to 80% are guaranteed using quite low 0.33C charge/discharge. So even at 0.5C continuous discharge which you recommend it won't last long (theoretically). If the real life experience isn't better - it would be a disappoin...
by thunderheart
Aug 09 2019 6:20am
Forum: Battery Technology
Topic: LG M50T Grade A high capacity 5000mAh 21700 cell's test
Replies: 8
Views: 287

LG M50T Grade A high capacity 5000mAh 21700 cell's test

LG INR21700 M50T is a 5000mAh Li-ion cell of 21700 size (also known as 2170). LG M50T was previously known as M50 (without T) and even in the tentative version of the datasheet the model name was M50. More than a year ago i tested it (Grade B) and compared with Samsung 48G but then i was using v2.5 ...
by thunderheart
Aug 05 2019 1:01am
Forum: Battery Technology
Topic: Charging 14s pack with 13s charger
Replies: 3
Views: 131

Re: Charging 14s pack with 13s charger

If I were to charge a 14s pack with a charger built for 13s (54.6V), any idea how much capacity would I be giving up? Is there any problem/danger doing this? I assume each cell would be at about 3.9V instead of 4.2V. I realize I will need to periodically charge with a 52V charger to balance the pac...
by thunderheart
Aug 02 2019 5:59pm
Forum: Battery Technology
Topic: Capacity test: Queen Battery QB18650 2000mAh 20A high-drain cell which surprised me
Replies: 2
Views: 158

Capacity test: Queen Battery QB18650 2000mAh 20A high-drain cell which surprised me

This is the 3rd 18650-size model in Queen Battery's lineup. I've already tested the 3000mAh low-drain and 2600mAh mid-drain ones. This one is rated at 2000mAh and supports continuous discharge at up to 20A. https://ic.pics.livejournal.com/thunderheartrev/71546108/264813/264813_original.jpg The batte...
by thunderheart
Jul 29 2019 4:59pm
Forum: Battery Technology
Topic: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)
Replies: 16
Views: 666

Re: Awesome study / information on NCA battery degradation (Panasonic NCR18650PD)

geekmystique wrote:
Jul 27 2019 3:54pm
If sensibly used, NCA cells should last well over 10 years and over 1000 cycles with still around 80% original capacity left (WOOHOO)
LiFePO4 cells would do better even if used careless + they support charging/discharging at wider temperature range.
by thunderheart
Jul 27 2019 2:09am
Forum: Battery Technology
Topic: Queen Battery QB26650-2500 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B
Replies: 6
Views: 230

Re: Queen Battery QB26650-2500 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B

neptronix wrote:
Jul 26 2019 7:45pm
You know what they would be fantastic for? they'd make a hell of a 12V car/motorcycle starter battery.
Bingo! If they were available 6 months ago i'd buy them instead of ANR26650M1Bs...
john61ct wrote:
Jul 26 2019 9:53pm
And safety all-important
And cycle life...
by thunderheart
Jul 26 2019 3:56am
Forum: Battery Technology
Topic: Queen Battery QB26650-2500 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B
Replies: 6
Views: 230

Queen Battery QB26650-2500 LiFePO4 cell's test + comparison with A123 Systems ANR26650M1B

Queen Battery QB26650-2500 is a 26650 size 2500mAh 50A/20C LiFePO4 cell which supports up to 125A/50C pulse discharge. https://ic.pics.livejournal.com/thunderheartrev/71546108/263034/263034_original.jpg The battery was bought from my reliable supplier ( Queen Battery ) and tested with ZKETECH EBC-A2...
by thunderheart
Jul 05 2019 5:22am
Forum: Battery Technology
Topic: Panasonic NCR18500A - 2000mAh 18500-size Li-ion cell's capacity test
Replies: 0
Views: 140

Panasonic NCR18500A - 2000mAh 18500-size Li-ion cell's capacity test

18500 shares the same 18mm diameter with 18650 but it's 15mm shorter (18x50mm). https://ic.pics.livejournal.com/thunderheartrev/71546108/260353/260353_original.jpg This size is often used in digital cameras' battery packs, usually in 2S configuration. https://ic.pics.livejournal.com/thunderheartrev/...
by thunderheart
Jul 01 2019 7:45am
Forum: Battery Technology
Topic: Queen Battery QB14500 700mAh - a 3.7V AA-size Li-ion battery's capacity test
Replies: 0
Views: 113

Queen Battery QB14500 700mAh - a 3.7V AA-size Li-ion battery's capacity test

14500 is the same well-known AA size we used to see. It means that the diameter of the cell is 14mm and it's 50mm long. 14500 is used to refer to 3.7V Li-ion or 3.2V LiFePO4 cells while AA is for 1.5V alkaline/other primary batteries and 1.2V Ni-Cd or Ni-MH rechargeable cells. Let's look at the diff...
by thunderheart
Jun 26 2019 3:11pm
Forum: Battery Technology
Topic: Samsung 29E version 6 (29E6) 2900mAh cell's capacity test
Replies: 0
Views: 153

Samsung 29E version 6 (29E6) 2900mAh cell's capacity test

Samsung INR18650-29E is available in 2 versions - version 6 (29E6) which is the hero of this test, and version 7 (29E7). Visually they differ by heat shrink tube color and the version is printed under "SAMSUNG" in marking. Samsung 29E is a 2900mAh 18650-size cell which supports discharge at up to 5....
by thunderheart
Jun 26 2019 3:01pm
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 343

Re: Correct charge voltage for Samsung 35E

Valman wrote:
Jun 26 2019 2:21pm
I wonder could there be any downside to me setting it to LiPo to get the 4.2v charge voltage I need?
No. Feel free to select Lipo and charge your cell to 4.2V
by thunderheart
Jun 26 2019 2:15pm
Forum: Battery Technology
Topic: Correct charge voltage for Samsung 35E
Replies: 7
Views: 343

Re: Correct charge voltage for Samsung 35E

Valman wrote:
Jun 26 2019 1:50pm
but setting up my isdt t8 charger, it seems to say 4.1v for LiIon and 4.2v for LiPo.
Someone at ISDT should be fired))
Valman wrote:
Jun 26 2019 1:50pm
Is the 35e actually a Lipo?
Of course it's not a Lipo)) BTW, Lipo is Li-ion too.
by thunderheart
Jun 22 2019 2:33am
Forum: Battery Technology
Topic: Samsung 26J (26JM) 2600mAh low price cell's capacity test
Replies: 0
Views: 107

Samsung 26J (26JM) 2600mAh low price cell's capacity test

Samsung ICR18650-26J is a 2600mAh Li-ion cell of 18650 size which supports continuous discharge at up to 5.2A. https://ic.pics.livejournal.com/thunderheartrev/71546108/256619/256619_original.jpg The battery was bought from my reliable supplier ( Queen Battery ) and tested with ZKETECH EBC-A20 and a ...
by thunderheart
Jun 16 2019 12:25pm
Forum: Battery Technology
Topic: Queen Battery QB10440 300mAh - a 3.7V AAA-size Li-ion battery
Replies: 2
Views: 227

Re: Queen Battery QB10440 300mAh - a 3.7V AAA-size Li-ion battery

Thanks Headrc!
It's the first time i tested such a tiny cell and came across the lower limitations of my tester))
by thunderheart
Jun 16 2019 1:38am
Forum: Battery Technology
Topic: Queen Battery QB10440 300mAh - a 3.7V AAA-size Li-ion battery
Replies: 2
Views: 227

Queen Battery QB10440 300mAh - a 3.7V AAA-size Li-ion battery

10440 size is more known as AAA - it means that the cell is 10mm in diameter and 44mm long. In Lithium world 10440 is a rare size but you can find 3.2V LiFePO4 and 3.7V Li-ion models just by googling "10440". To feel the difference let's take a look at 10440 (AAA) next to 14500 (AA) and 18650: https...
by thunderheart
Jun 14 2019 2:27am
Forum: Battery Technology
Topic: Samsung 30Q - high drain 18650 Li-ion cell's capacity test
Replies: 30
Views: 1461

Re: Samsung 30Q - high drain 18650 Li-ion cell's capacity test

so really this is not really a high capacity/high discharge cell at all if you want a decent lifespan. Agree and disagree at the same time. 1. 15A is somewhere at the bottom of what i call "high-drain range", very close to mid-drain but not there actually. So a 25A or 30A cell would look much prefe...
by thunderheart
Jun 14 2019 2:13am
Forum: Battery Technology
Topic: SANYO UR18650ZK - low drain 2500mAh cell's capacity test
Replies: 4
Views: 274

Re: SANYO UR18650ZK - low drain 2500mAh cell's capacity test

john61ct wrote:
Jun 13 2019 6:43am
Sure but IMO experience reports and rigorous testing by trusted third parties are often better.
Of course they are. The problem is the lack of any data on this cell.