MAC Ebike Kit -- 50V (14S5P) RECTANGLE PACK (10.5AH-15.8AH OPTIONS)

We offer various Samsung cell types, in addition to the standard ICR18650-22 (NCM cell, 3C rated, approximately 2.1Ah) cell. These new cell types are the High Energy INR18650-29E (NCA Cell, 3C Max rated cell, with approx 2.85Ah nominal Capacity) and INR18650-32E (NCA, 3C Max, ~3.15Ah). There is also the High Power cells, the INR18650-25R and INR18650-30Q. These are NCA type cells, ~8C rated with Capacity of approximately 2.45Ah (25R) and ~5C rated and capacity of 2.95Ah for the 30Q cell. Regardless of the cell type used, the dimensions of the pack are unchanged. The 29E, 32E and 30Q Cells are approximately 6% heavier than the the 22P and the 25R cells, so the weight of a finished pack built with these will be slightly heavier.



This Samsung Pack uses our robust and reliable 14S 40A Li Ion type BMS. As with all our packs a pre-charge is fitted as standard. 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. We use the XT90-S pre-charge connector. It is essential a Pre-Charge is used when connecting to the controller to avoid the large spark that occurs without such a system. This will avoid issues with connectors and the Battery BMS. Various optional chargers are offered.



Specification:



We use 14S (50.4V, based on 14*3.6V), not 13S (46.8V nominal, based on 13* 3.6V) like everybody else, 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 from somewhere else (7.7% extra versus a 13S equivalent). Our 14S NCM packs have very similar charge and discharge voltages to our 16S A123 packs.

We conservatively rate the cells as 2.45Ah (25R), 2.10Ah (22P), 2.85Ah (29E) and 2.95Ah (30Q) and 3.15Ah (32E). Although the manufacturer classes them a little higher than this. Like with any Li Ion type battery, best long term performance is obtained by not using all of the available capacity all of the time.

Energy Density of 150Whrs plus for finished pack.

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.

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.

Charge Voltage of 58.8V for 100% charger, 57.4V for 90% Charge (our NCM chargers include a switch to charge to 100%, 90% and 50%).

Maximum Charge Current 12A max (BMS limited).

Discharge Current, recommended 20A or less (22P), 20A (29E), 25A (32E) 40A+ (25R and 30Q).

Dimensions: 75mm thick. 203mm long, 138mm wide.

Weight: 3.5kg (25R and 22P), 3.7kg (32E and 30Q)