Buying an untested ebike battery is always risky because there is a lot of uncertainty. The EXECYC 52V 20Ah pack (Amazon link), is somewhat safer. This pack leans heavily on two things that are verifiable: LG branded 5000mAh cells and a BMS that is rated for 50A and capable of handling motors up to 2000W.
The seller is the Unit Pack Power official store. Since there are no Amazon reviews yet, the LG cell and the BMS spec become your trust story here.
Specs and Build Quality
The EXECYC is a 52V nominal battery that contains 20Ah of capacity. Therefore, it stores approximately 1040Wh of electricity. The pack comes with LG 5000mAh cells inside the pack, a 50A BMS, and a 5-pin base that is already mounted so that you don't have to drill or strip any wires to attach it. Additionally, the discharge cables branch off into male/female XT60 connectors allowing you flexibility when connecting to your rear-hub controller.
Physical dimensions are 368 by 96 by 125mm. There is a size-check warning included in the description. You should check whether your battery tube or bag will fit before purchasing. The battery case is water resistant, there are anti-vibration rubber pads attached to the bottom of the case, and an LED power indicator shows the remaining charge. A mechanical power switch and safe lock anti-theft mechanism are bolted to the case.
Male and female split XT60 allows you to tee power to a display unit or another load without using a Y adapter. Anti-vibration pads protect against vibration on tough commutes where connection issues kill packs faster than DoD. Starting with a known chemistry (LG) inside an unbranded shell is much more important than the name on the exterior.
The BMS Story: Why 50 Amps Matter
Using fifty amps on the discharge side makes this battery suitable for a higher class of motor. A 2000W motor operating at 52V will pull around thirty eight amps of current at wide-open-throttle. A 1500W motor will pull twenty-nine amps. Fifty amp BMS ensures both of those values remain within limits. Thirty amp BMS would provide enough headroom for the 1500W motor but would clip the top end of a 2000W motor and result in lower voltage, and therefore slower top speeds during climbs.
The BMS provides protection against overcharging, under charging, over currenting, and overheating. That is standard for any good quality pack. however, the fifty amp rating of the BMS indicates that the internal wiring and contactor arrangement were designed to supply high currents for extended periods of time to match the demands of a 2000W build that uses a motor that pulls large amounts of current during climbs for multiple minutes at a time.
The BMS does not tell you how the cells are balanced. Passive cell balancing occurs through the BMS alone. Active balancing requires adding a dedicated balance board. EXECYC did not provide information regarding balancing method. Therefore, until actual customers provide reports of voltage drift across all cells over long term use, you will have to rely on published specifications to determine cell longevity. Published specifications indicate that an LG pack with these characteristics will retain eighty percent of original capacity for over 800 cycles based upon manufacturer testing.
LG is one of only two suppliers publishing cycle life data and providing testing conditions (LG). That translates directly to packs using their cells. You are not receiving a pack containing unknown cells from some black market vendor claiming to be "the brand". You are getting a pack that was produced from a real supplier.
That is the basis for establishing trust.
Expected Range and Charging Times
You cannot confirm or deny the actual range expectations stated in the listing. Range depends on several variables including rider weight, terrain difficulty, assist mode used, tire inflation pressure, wind resistance, etc. What you can do is calculate expected range from capacity.
A typical rear hub conversion powered by a 2000 W motor operating on flat terrain at low assist modes (approximately 20 Wh/mile) results in estimated range of 50 miles using pedal assist. Operating full throttle with regenerative braking disengaged reduces range to approximately thirty miles. Using a 1500 W motor on the same ride extends range to approximately 55 miles before dropping below twenty percent of total capacity.
The listing states that the pack exceeds one thousand charge cycles with at least eighty percent capacity remaining after eight hundred charge/discharge cycles. That figure aligns with typical behavior for LG's NMC style 21700 cells. However, what really matters for you is how you recharge it. Recharging from empty takes approximately five hours using a 2A charger. Using a 4A charger shortens that time to slightly over two and a half hours.
Match your charger's output to your pack's input specification voltage. Many generic chargers for 52 V packs have xt60 connectors. , no LiFePO4). 65V/cell. 20V/cell. Incorrect voltage profiles either prevent your pack from being charged completely or destroy your BMS by continuously under-charging your pack each ride.
Who This Battery is for
This pack is ideal for riders building an eBike using a standard bike frame converted to electric using a rear hub motor in the range of 1000 W to 2000 W. The combination of forty nine volts and fifty amps enables clean operation in this power range. The five pin base and pre-mounted wiring enable easy installation into virtually any generic conversion kit battery tube bag without additional modifications required. The size-check warning provided in the listing requires you to verify that your bag will accommodate this pack prior to making your purchase.
Skip this option if you require a lightweight pack that can be carried in a backpack. Twenty Ah @ 52 Volts weighs considerably more than feather-light. Also, avoid this option if your motor kit operates using a 48V electrical system. This is a 52 Volt pack. Connect this pack to a Bafang mid drive operated at 48 Volts and your controler will be confused by the differing voltages.
There are currently no Amazon reviews available for this product. Your purchase decision will be made based on specified attributes only. In terms of foundations for establishing trust, the LG cells and fifty amp BMS provide a strong starting point. however, you will be among the first users of this product. Prior users may wish to establish cell balance history, as indicated earlier, before making their own purchases. Alternatively, if you are looking for immediate power and trust the cell manufacturer, this is an acceptable compromise given the lack of review history from previous purchasers. Lack of reviews represents a legitimate risk for anyone who has experienced previously purchased mystery packs.
Visit our complete ebike batteries comparison page if you would like compare specific specs side-by-side. Review our ebike conversion kits section if you continue to assemble your eBike build.
Frequently Asked Questions
Common questions about the This product, answered briefly.
What Type of Motors Can This Battery Support?
According to the listing, this battery supports motors ranging in power from ninety watts to two thousand watts. With fifty amp capability on the discharge side, this battery can sustain high levels of current associated with high-end motors.
How Many Cells Comprise the Pack?
The pack consists of four LG 5000 mAh cells arranged in fourteen series / four parallel configuration resulting in fifty-two volts and twenty amperes.
Will This Pack Come with a Charger?
No, there is no charger included with this pack. When selecting a charger for use with this pack, select one that is compatible with fifty-two volts with an appropriate current rating based upon your anticipated usage patterns.
Is the Safe Lock Mechanism Reliable?
The safe lock is a mechanical device that locks the battery case door closed preventing unwanted access to the interior components of the pack. While this mechanism may deter someone attempting to quickly steal your eBike parked on street parking where thieves typically look for an easily accessible target, it will certainly not prevent a motivated individual with bolt cutters from accessing your pack contents.
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