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  1. eMark

    Tesla 3 2170 Panasonic or Samsung 50e (from BatteryEVO)

    Battery Hookup just got in another supply of 2170 50e cells a couplle days ago, but quickly sold out ... 8 Samsung INR21700-50E 2170 4800mah ... Was going to buy 48 ... "Sorry, We had an ebike company clear us out. Should have more in the future." (from BH) So decided to purchase two of these...
  2. eMark

    China's Devaluation Of Dollar ... Is It Coming ?

    Is such a scenario possible with America's debt having surpassed 31 trillion dollars ? YR1030+ Internal Resistance Tester - $1,155 to $1,575...
  3. eMark

    Math Question to Electrical Engineers about BMS Capacity...

    9.6amp cell energy rating x 4 in parallel = 38.4amps x 10% = 3.84 amps + 38.4 amps = 42.24 amps. It doesn't cost but a few dollars more for a 50amp BMS. Before deciding what BMS determine the Controller's amp rating. If you have a 50amp Controller get at least a 55amp BMS or better yet a 60amp...
  4. eMark

    More Power, Capacity and Less Expensive (21700)

    2170s provide more bang for the $ (or €) than 1865s ... plus 2170s aren't as expensive! Apparently less expensive to manufacture 2170 cells than 1865 cells. Tesla decided to switch from cyclindrical 1865s to 2170s and now the new cyclindrical 4680 appears to be Tesla's favored cylindrical...
  5. eMark

    PreTest New Cells (Delta OCV) B4 Spot Welding

    It's really your responsibilty (not the manufacturer) to Pre-TEST your Brand New 18650 cells and decide whether you'd rate them as Grade A or Grade B before building your pack. Hopefully, saving you some future frustration. You'll need to devise your own benchmarks for grading new cells, cells...
  6. eMark

    New Improved 30Q6 150 T Cells Made In China

    Voltaplex (China) currently stocks the 30Q6 150 LE1T at $5.51 USD per cell ...
  7. eMark

    Turboant X7 Pro -- Fold Down Seat / Extended Foot Rests / Cargo Platform

    Being 77 years young an e-scooter with a seat was a must, but needed to do some mods. Supposedly if you are 55+ advised not to use a standup e-scooter. Comfortably seated with extended foot rests i'm riding a 'hog' e-scooter :wink: 85% of travel is level terrain, 15% is slight inclines. The...
  8. eMark

    Delta Voltage (OCV) And Any Significance To Li-ion mV Self-Discharge

    This thread is for a certain ES member to either trash it's Title, trash talk the OP, assume ownership, give it his best effort or ignore altogether. For me to first offer my 2 cents worth may only encourage his brash disconcerting comment(s) which he seems to relish. Especially when it comes...
  9. eMark

    Bus Bars or Bus Plates For A Triangular DIY Build ?

    It's been previously agreed that in a DIY build it's possible for all the cylindrical cells to function as both cells with series connections as well as the same number of cells having parallel connections. Same cell(s) that deliver voltage power also the same cells that deliver amperage...
  10. eMark

    Number of Series Cells? -- NOT Series Strings or Series Voltage

    . At first glance, and second, and third and ... thought the following photo was 10S12P ... really can't tell from photo that it's actually 20S6P. If you look really, really close at the top right cell in the middle top group of 12 you can barely make out the negative end (with some imagination...
  11. eMark

    How Do You Figure The Number of Series Cells In This Triangular Configuration

    . It's easy to determine the total number of parallel cells (100) in this triangular "10S /10P" configuration. BUT what about when it comes to determining the total number of series cells connections POSSIBLE in this following triangular pack design ? What's the total number of series cells in...
  12. eMark

    How Many Series Cells In Following Configurations ... Advantage Of The More The Better ?

    See last post #45 on p.2 How many series cells in this Lithium-ion battery configuration ? Whar's the most number of series cells possible in this triangular Lithium-ion battery configuration ? What's the most number of series cells possible in this triangular Lithium-ion battery...
  13. eMark

    Reverse eTrike Primarily For Snow/Ice As Well As All Season

    At 77 and 180 lbs walking 2 miles (round trip) getting groceries is good exercise, but becoming more of a winter struggle. I'm thinking of buying (if one exists) or building an adult reverse 3-wheel etrike primarily for winter errands. Might need a license if a 4-wheel eQuad. What kit would you...
  14. eMark

    Self-Discharge UPDATE On 30Q 141 Cells

    A couple reasons i went with 30Q 15A even with my "conservative" etriking ... 1) With it's low IR wanted to see if i could get 500 cycles from my 10S3P 30Q 141 pack over 3-4 years by charging to only 4.1V and discharging to only 3.5V. Hopefully, maintaining enough capacity for a 5-6 mile round...
  15. eMark

    Continuous Charge Amp vs Continuous Discharge Amp

    For the sake of this comparison we'll use a 12S6P (w/smart BMS) pack of LG HG2 3000mAh cells rated at 20A maximum continuous discharge, and a Charger quite capable of charging at a 6A rate without breaking into a sweat :thumb: The HG2 Data Sheet ...
  16. eMark

    I Don't Get It ?

    Why would anyone pay $1,400 for an EMOVE Cruiser (electric scooter) with an actual range of 62 miles (100 km) at full throttle having to stand up all the time ? At least widen the footboard for sitting with foot rests up front and a telescoping column that can be lowered. Just like i don't get...
  17. eMark

    BMS with optional Bottom and/or Top Balancing

    deleted due to interference
  18. eMark

    Parallel "Groups" or Parallel Strings or Neither ?

    The current thinking by at least one member seems to be that the Parallel cells in a 18650 pack should always be referred to as a "group" and never (God Forbid) as a "string" otherwise those in the KNOW will see it as "Ridiculous poppycock" if ever someone were to refer to parallel cells in a...
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