Product Details

MAC battery

Our 47V frame pack (13S4P) is offered with various cell types, the specification of each variant, is detailed in the table below. These frame mounted packs are lockable, water resistant and have a USB charging outlet (for phone etc). There is also a simple battery level LED indication and the battery has a power switch which has an LED to indicate when power is on. This power switch does not pass the discharge current, it only switches the BMS output on/off. This means a Pre-charge is not necessary for this battery, and means the switch is not liable to failure, as is so common on packs that pass the discharge current through a switch.

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. 4mm bullet will be fitted to the cables exiting the slider as standard. A suitable 54.6V, 2.0A charger is offered. The slider is easily mounted to the frame using the water bottle mountings.

Item specification

Specification:

54.6V 2A fan-less, plastic case charger is an optional extra. This is a good quality charger (very reliable in our experience) with UL and CE (the charger may differ from the images shown).

We conservatively rate the cells as 2.1Ah each (SDI-ICR18650-22P), 2.45Ah (SDI-INR18650-25R), 2.95Ah (INR18650-30Q) and 3.15Ah (SDI INR18650-32E), although the maker 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 and by not using the pack at high discharge rates which will cause excessive cell heating and premature aging.

Cycle Life estimated at 700 cycles plus (1C discharge to 2.75V, 1C charge to 4.2V). Cycle life is extended by charging to 90%, limiting discharge to 90% and also by more moderate usage. To accurately limit discharge the Cycle Analyst is a great tool. Cycle Life will be reduced if the Pack is regularly used at continuous high discharge rates, so please match the battery pack to the rest of the kit.

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.

Maximum Charge Current 3A max (BMS has a 3A PPTC fitted for protection and also the DC2.1 Charge plug is fitted to this Pack, which is also rated 3A max). We will investigate increasing this in the future. See suitable chargers in related products.

There is very limited space in this case for a large BMS, the BMS in the frame pack is 20A continuous rated, but can deliver much more for short bursts. We recommend a controller rating of approx ~18A with the 22P and 32E packs. The high Power 30Q and 25R cells can deliver 30A or more, but we recommend the continuous discharge rate is kept to not more than 25A to avoid stressing the BMS. This is not a high power battery pack, at least not by EM3ev standards.

Maximum dimensions of: 85mm thick. 130mm tall, 350mm long. See labelled picture in additional images for detailed information, as it has a complex shape.

Weight: 13S 4P, 22P - 3.7kg, 13S 4P, 25R - 3.7kg,13S 4P, 32E - 3.9kg, 13S 4P, 30Q - 3.9kg (including slider)

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