Shenzhen RYDBATT Electronics Co., Ltd. is one of the leading manufacturers and suppliers of 48v 13.5ah silver fish e-bike battery pack in China. Welcome to buy CE approved batteries in stock here and get free sample from our factory. All customized products are with high quality and low price.
High Energy Density
39 matched 21700 cells in a 13S3P array deliver 13.5Ah /648Wh inside a slim silver-fish housing
Smart Split-Port BMS
Charging and discharging run on separate circuits, so the pack keeps full over-charge protection while charging.
Keyed Anti-Theft Lock
A built-in cylinder lock and a manual on/off switch keep the pack secured on the frame and stop unauthorised use.
Long Service Life
Vibration tested on all three axes and rated for 500+ cycles while still holding more than 80% of original capacity.
48V 13.5Ah Silver Fish E-Bike Battery Pack
Model RYD-4813ALX072 | 13S3P 21700 | Rear-Rack /Seat-Tube Mount
648Wh of lithium energy in a slim silver-fish housing - smart split-port BMS, keyed anti-theft lock and a built-in LED charge gauge, made for
48V e-bikes and light electric vehicles.
√UL 2271 Certified √648 Wh √≤18 A Continuous √ Keyed Lock
NOMINAL VOLTAGE
RATED CAPACITY
ENERGY
PACK WEIGHT
Range you can actually measure
Every rating below is taken straight from the approved product specificationtested at 25°C with a standard 0.2C charge/discharge profile.
Typical capacity at 0.2C, with a guaranteed 12.54Ah minimum-measured on every production batch.
Nominal energy at 48V. Enough for long commutes, loaded cargo runs and full-day rental duty.
Full charge / discharge cycles at 25°C before capacity drops below
80% of the first-cycle value.
Low AC internal resistance keeps voltage sag small, so the motor gets full current without overheating.
- DMEGC INR21700-45E cells-4.5Ah each, 3.6V nominal, under 76g with less than
- 30mΩ internal resistance.
- 13S3P configuration -13 series groups of 3 parallel cells, the sweet spot of voltage and capacity in a slim case.
- Strict pairing standard- cells matched to s30mAh capacity spread, s5mV voltage spread and s3mΩ resistance spread.
- Vibration qualified- swept 10-55Hz on X, Y and Z axes for 30 minutes each with no change in performance or appearance.
- Housed and aged-sealed silver-fish enclosure, 100% aging tested before shipment, shipped at 49.3-50.4V (SOC s70%).
Protection that never sleeps
Over-Charge
4.25 V/ cell
Releases at 4.15V. 1s delay- ±25mV
Over-Discharge
2.75 V/ cell
Releases at 3.00V · 1s delay · ±80mV
Charge Over-Current
8A
Auto-releases when the charger is removed
Discharge Over-Current
56 A/76 A
Two-level, releases on load removal
Short Circuit
~400 μs
Hard cut-off, releases when the load is removed
Charge Temperature
55°C/0°C
High and low temperature cut-off
Discharge Temperature
75°C/-20°C
Cell surface sensor, 10K B3435 NTC
Split-Port Board
≥35 mΩ
BAT- vs PACK- main circuit resistance
Split-port design: charge and discharge, separated
Full specification sheet
| Model | RYD-4813ALX072 |
| Product code | 8177211303012 |
| Chemistry | Lithium-ion (Li-NMC), cylindrical 21700 |
| Cell | DMEGC INR21700-45E 4.5Ah · 3.6V · <30mΩ · 3C |
| Configuration | 13S3P - 39 cells |
| Nominal voltage | 48 V 13 series groups |
| Charge cut-off voltage | 54.6 V charger 53.95V |
| Discharge cut-off voltage | 36.4 V |
| Rated capacity | 13.5 Ah typical / 12.54 Ah minimum @0.2C |
| Nominal energy | ≈ 648 Wh 48V × 13.5Ah |
| Max. charge current | ≤ 5 A UL 2271 rated 3A |
| Max. continuous discharge current | ≤ 18 A UL 2271 rated 15A cont. / 18A peak |
| Internal resistance | < 150 mΩ ACIR, pack level |
| Cycle life | ≥ 500 cycles ≥80% capacity @25°C |
| Charge temperature | 3 – 45 °C UL 2271 rated 0–45°C |
| Discharge temperature | –10 – 60 °C UL 2271 rated –20–45°C |
| Storage temperature | ≤1 month: –20–45°C ≤3 months: –10–30°C ≤1 year: 0–30°C |
| Dimensions (L×W×H) | 380 × 110.4 × 76 mm maximum, ±1–2mm |
| Weight | 3.5 ± 0.5 kg |
| Enclosure | Silver-fish ABS housing, sealed build with keyed lock |
| Safety | Over-charge / over-discharge / over-current / short circuit / temperature cell + BMS level |
| Warranty | 12 months or 500 cycles, whichever comes first |
Frequently Asked Questions
Q: What is the model and product code of this battery?
A: The battery model is RYD-4813ALX072, and its product code is 8177211303012.
Q: What type of chemistry and cells are used?
A: The battery utilizes Lithium-ion (Li-NMC) chemistry with cylindrical 21700 cells. Specifically, it uses DMEGC INR21700-45E cells (4.5Ah, 3.6V, <30mΩ, 3C).
Q: What is the battery configuration and nominal capacity?
A: The battery is configured as 13S3P (comprising 39 cells in total). It has a nominal voltage of 48V (13 series groups) and a rated capacity of 13.5 Ah typical (12.54 Ah minimum @ 0.2C), providing a nominal energy of approximately 648 Wh.
Q: What are the charge and discharge cut-off voltages?
A: Charge cut-off voltage: 54.6 V (with a 53.95V charger).
Discharge cut-off voltage: 36.4 V.
Q: What are the maximum current limits for charging and discharging?
A: Max. Charge Current: ≤ 5 A (UL 2271 rated 3A).
Max. Continuous Discharge Current: ≤ 18 A (UL 2271 rated 15A continuous / 18A peak).
Q: What is the expected cycle life of the battery?
A: The battery can achieve ≥ 500 cycles while retaining ≥80% of its capacity at 25°C.
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