KT-E33-PRO — 52V Down-Tube Battery, Four-Point Rail
The KT-E33 electrical platform on a four-fixing 60mm-pitch rail — the 52V option for cargo, fleet and heavily loaded frames.
Key Details
- MOQ
- From 100 pcs
- Sample Lead Time
- 5–10 working days
- Mass Production
- 2–4 weeks after approval
- Voltage
- 52V
- Capacity Range
- 20–30Ah
- Form Factor
- Down-tube / shark
Cell Brands
The KT-E33-PRO is the four-point-rail version of the KT-E33. Electrically the two are identical: the same 367.5 × 157.48 × 95.0mm case, the same 112-cell 14S8P 18650 build at 52V 20Ah, the same 84-cell 14S6P 21700 build at 52V 30Ah. The rail is what differs — four fixings at 85.4mm then 60mm pitch, against three at 83.75mm then 57mm.
This is the heaviest external pack in the catalog. A 52V 30Ah build is roughly 1,560Wh, and that mass sits on a bracket bolted to a tube that flexes under load. The fourth fixing is not a specification upgrade so much as an acknowledgement of where this platform gets used: cargo and fleet bikes, ridden loaded, with packs removed for charging every day.
The rail pitches are not interchangeable
Sixty millimetres against fifty-seven, and a first fixing 1.65mm further from the datum. That is enough that a frame drilled for one will not take the other, and it is the most common late-stage fit failure we see on down-tube programmes. Send the drill pattern with the RFQ rather than after the sample.
Where this sits in the range
If the frame does not need the four-point rail, the KT-E33 is the same pack for less mechanical work. If the programme is 48V rather than 52V, the KT-E09-PRO carries the same four-point rail in a case 17mm shorter. And if the battery should disappear into the frame rather than hang off it, the KT-E60-PRO reaches 40Ah in an integrated enclosure. CE and UN 38.3 files are issued per configuration.
Technical Specifications
| Enclosure Format | Down-tube / shark (external, removable) |
|---|---|
| 18650 Configuration | 112 cells · 14S8P · 52V 20Ah |
| 21700 Configuration | 84 cells · 14S6P · 52V 30Ah |
| Case Dimensions | 367.5 mm long · 157.48 mm high · 95.0 mm wide |
| 18650 Cell Block | 314.89 × 135.67 mm (Ø18.5 mm cells) |
| 21700 Cell Block | 316.2 × 140.62 mm (Ø21.7 mm cells) |
| Mounting Rail | 85.4 mm to first fixing, then 60.0 / 60.0 / 60.0 mm pitch (4 fixings) |
| Outputs | USB · DC2.1 / DC2.5 charge port · power switch (right-hand side) |
| Cell Format | 18650 or 21700 |
| BMS | In-house 14S BMS, current rating matched to parallel count |
| Connector | Specified per programme (XT60 / Anderson / Higo / Julet / custom) |
| MOQ | From 100 pcs |
| Sample Lead Time | 5–10 working days |
| Mass Production | 2–4 weeks after approval |
Inside Every Pack
The same engineering standards apply to every configuration we ship — from cell selection to the final welded enclosure.
Tier-1 Brand Cells
Samsung, LG, Panasonic, EVE and BAK cells — graded and capacity-matched before assembly.
Multi-Protection BMS
Over-charge, over-discharge, short-circuit and temperature protection on every pack.
Welded Construction
Nickel strips welded for low-resistance, vibration-resistant joints inside a sealed enclosure.
Applications
Certifications Included
Test reports and certificates are included in shipment documentation at no additional cost.
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From 100 pcs · Samples in 5–10 working days · Mass production 2–4 weeks after approval
Frequently Asked Questions
What separates the KT-E33-PRO from the KT-E33?
The mounting rail only. Same 367.5 × 157.48 × 95.0mm case, same 14S8P 20Ah and 14S6P 30Ah builds. The PRO carries four fixings at 85.4mm then 60mm pitch; the KT-E33 carries three at 83.75mm then 57mm.
Is the four-point rail necessary at 30Ah?
It is worth specifying. A 52V 30Ah pack is around 1,560Wh and correspondingly heavy, and it hangs off the down tube as a cantilevered mass. Four fixings distribute that better than three, particularly on frames that also carry cargo.
Can a KT-E33-PRO pack be fitted to a frame drilled for the KT-E33?
Not without re-drilling — the pitches genuinely differ (60mm against 57mm) and the first fixing sits 1.65mm further out. Confirm the pattern before sampling; this is the single most common fit error on down-tube programmes.
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