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EM3ev 52V (14S9P) Large Triangle Ebike Battery Pack With Bag

From: $649.00 $584.10 (USD)

In stock
2 Reviews
(2 customer reviews)

From: $649.00 $584.10 (USD)

The Original, EM3ev Triangle Pack

50V (14S9P) Large Triangle Battery Pack With Smart BMS Options

58.8V Charger (for 14S, 50/52V Battery) – optional

Grin Satiator Including Anderson Adaptor (48V Version, Contact us if you require 72V) – optional

AC Plug for Charger – optional

  • REVIEWS (2)

Em3ev 52V (14S9P) Large Triangle Ebike Battery Pack With Bag

EM3ev 50V (AKA 52V, 14S9P) Large Triangle Ebike Battery Pack With Bag

We now are fitting the 14s9p Large Triangle Ebike battery pack with a Smart BMS and power switch. The Smart BMS allows the cell group voltage, temperature and battery capacity percentage to be monitored via an Android app through a Bluetooth connection. The Smart BMS will balance the cells even at a 90% charge.


Here at EM3ev, we build our own battery packs in our own small, but well equipped factory, with numerous expensive machinery that we have purchased over the years. We have a small and stable group of staff, that take great pride in doing the best job they can (several of which are family members). We have established an excellent reputation for supplying well built, safe and reliable battery packs and on the odd occasion when something might break, we will be there to help (1 year warranty, which we stand behind).

We use only proven parts (and try to stick with them) from the genuine sources (not random cell suppliers that are pushing the next greatest thing). We understand that a battery is expensive and that safety is more important than anything else. We come with an Engineers Mind-set, we always try to under-promise, and over-deliver, with conservative ratings and recommendations.

EM3ev 52V (14S9P) Large Triangle Ebike Battery Pack Cell Specs

We offer several types of Samsung cell in our packs, details of the performance for each variant of this pack are detailed in the table further down this listing. We have the ICR18650-22 (NCM cell, 3C rated, approximately 2.1Ah) cell. We also have the High Energy density INR18650-32E (NCA Cell, 2C Max rated cell, with approx. 3.15Ah nominal Capacity) andPanasonic PF (NCA 2C recommeded Max, 3C Max burst current ~2.85Ah).

There are also 2 High Power cells, the INR18650-25R and the INR18650-30Q. These are NCA type cell, 8C (25R) and 5C (30Q) rated cells with Capacities of approximately 2.45Ah (25R),2.85Ah (Panasonic PF) and 2.95Ah (30Q). Regardless of the cell type used, the dimensions of the pack are unchanged.

Combined with our custom EM3ev triangle bags even a relatively small frame, can accommodate our large triangle pack, where the weight (spec dependent, 6.4-6.8kg) is barely noticed. If you need compact size and high power, the 25R or 30Q are the best choices. If you also want to have the highest possible capacity, combined with high power, the 30Q pack is the best choice. Various chargers are offered as optional extras. The triangle bag is included free of charge. We offer the smaller 6P Triangle Pack here, if you don’t need this much capacity, or don’t have the space.

Specification for Each Variant of the EM3ev 50V (AKA 52V, 14S9P) Large Triangle Ebike Battery Pack:




Cell Type Capacity (Ah) Capacity (Whrs) Max Cont. Current Max Burst Current Weight
Standard-22P 50.4V 18.9Ah 953Whrs ~38A ~55A 6.4kg
High Energy-33G 50.4V 27.9Ah 1406Whrs ~40A ~55A 6.8kg
High Energy-PF 50.4V 25.7Ah 1295Whrs ~40A ~55A 6.8kg
High Power-25R 50.4V 22.1Ah 1111Whrs ~40A ~55A 6.4kg
High Power-30Q 50.4V 26.6Ah 1338Whrs ~40A ~55A 6.8kg
High Power-MJ1 50.4V 30.6Ah 1542Whrs ~40A ~55A 6.8kg
High Power-35E 50.4V 30.6Ah 1542Whrs ~40A ~55A 6.8kg

Please note we recommend a max of no more than 50A for the Smart BMS. The trip current is set just above 60A. 

Our Large Triangle Pack (14S9P) uses a robust and reliable 14S 40A Li Ion type BMS. As with all our packs a pre-charge is fitted as standard (XT90-S). This is a must have feature with these High Discharge Battery Packs in our experience, to avoid issues with connectors and the electronic components. Cells are bonded into a pack using a special RTV with; high insulation resistance, which is flexible but also very strong. All signal cables are terminated via a PPTC as with all our packs to protect against a short. Even a dead short on the BMS Signal wires will not cause a hazardous situation

Please note that when a battery is ordered with a kit, we will make the controller to battery connections plug and play including Pre-Charge. If battery is purchased without a controller, we will supply a matching tail which should be linked to your existing controller supply. It is essential that a Pre-Charge is used, to avoid the large spark that would occur when you connect a controller to a powerful battery. The Pre-Charger will avoid issues with connectors and the Battery BMS.

EM3ev 52V (14S9P) Large Triangle Ebike Battery Pack Features:

  • Tightly packed triangle layout, with lots of protection to provide good mechanical protection.
  • We use 14S (50.4V, based on 14*3.6V), not 13S (46.8V nominal, based on 13* 3.6V), so that means a working voltage of over 48V most of the time and it also means that you’re getting that much more capacity than you would have had with an equivalent 13S Pack (7.7% additional capacity versus a 13S equivalent).
  • PPTC thermal fuses used on all signal wires. If a fault were to ever occur on any of the small balance wires which run around the battery pack, the fuse simply shuts down the connection and keeps everything safe. Once the fault condition is removed, function returns to normal.

EM3ev 52V (14S9P) Large Triangle Ebike Battery Pack Specification:

  1. Nominal Voltage of 50.4V, assuming 3.6V nominal cell voltage.
  2. Cycle Life estimated at 500-700 cycles (to 80% Retained) with 100% Charge and 100% discharge cycles. Cycle life is extended (possibly doubled) by charging to 90% and limiting discharge to 90%, so you use 80% of the available capacity (most, but not all of the time). We make it easy to control the Charge voltage with our switching charger. To accurately limit discharge the Cycle Analyst is a great tool. Using continuous High Discharge Rates, over the recommended levels will cause cell heating and can shorten cycle life.
  3. Charge Voltage of 58.8V for 100% charge, 57.4V for 90% Charge (our 58.8V 5A NCM charger include a switch to charge to 100% and 90%). The Satiator charger allows charging to any SOC. Our small 58.8V 2A charger are very reliable and cost effective, but be aware that charging takes longer with just a 2A charge rate.
  4. Maximum Charge Current 12A max (BMS limited).
  5. Dimensions: ~75mm thick. 345mm long, 205mm high (detailed dimensions shown in additional images). The pack shape and dimensions are identical, regardless of cell type. Please add 1.5cm to 2cm on each face to allow for the triangle bag’s padding.

Lead-Times For Battery Pack

If we don’t have the battery pack already built in stock, the lead time is approx. 5 to 7 working days for us to build one once the order has been placed. We have streamlined our building process and the lead time is now 3 to 4 working days.


2 reviews for EM3ev 52V (14S9P) Large Triangle Ebike Battery Pack With Bag

  1. 5 out of 5

    (verified owner):

    Just got the large triangle battery with the 30Q cells a few days ago (took about a month from ordering to arriving at my door, even in the middle of the busiest time year!) and I am VERY impressed! The battery was well packaged in foam and I like that it comes with an Anti-Spark XT90 connector on the discharge side. Build Quality looks good, like the bag that comes with it, should be more than enough to keep the weather out. Haven’t had a chance to mess around with the Android app for the BMS, but so far I have gone on a couple short trips with my delivery bike (30 miles and 26 miles) doing Uber Eats. I will post up-dates here as I get more time to really test, but so far, it has been giving me great performance! No sag on the cells to speak of (55V under 1300 watts load climbing a 7 – 12% grade traveling 20 MPH no pedaling with BBSHD on a heavy cargo recumbent bicycle, gross weight approximately 240 – 260 lbs, 160lb rider, approx weight of Ebike 80 – 100 lbs) and I blasted up the mile & a half long hill here in Oregon City, OR (ranges between 7 – 15% grade!) and resting voltage was only down to 57V from full being 58.7V! The BMS seems to be doing it’s job just fine, soon I will be running a Luda controller from Luna Cycle and see if I can get 20 MPH no pedaling even at the steepest grades!

  2. 5 out of 5

    (verified owner):

    Battery has been great so far. Only complaint is that the charge connector is not an Anderson PP as shown on the pictures. It’s a connector I’ve not seen before on any electronics. Luckily the charger I bought in combo that was also shown with an Anderson PP connector also was swapped for the new connector. The android app is nice and keeps a log of discharge in a given session.

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