Description

36V 15Ah Downtube E-Bike Battery – Compact Lithium Pack for City and Commuter Conversions

Name: 36V 15Ah Downtube E-Bike Battery
Brand: All4ebikes
SKU: 33
Price: 1285.12 RON
Availability: InStock

The 36V 15Ah downtube battery is the right entry-level solution for riders who want a light, compact pack with enough energy for daily commuting and leisure rides. Built around 10 cells in series, it pairs naturally with 250W–350W hub motor conversions.

36V 15Ah ~540Wh Downtube Design LCD Display USB Port ~4 kg

The downtube format places the battery along the bicycle's down tube – the largest structural tube on most frames – using a standard mounting bracket and key lock. This keeps the weight low and centred for balanced handling, and remains the most widely compatible mounting style across road, MTB, hybrid and commuter frames.

36V 15Ah Downtube Battery Technical Specifications

Electrical Parameters

Nominal voltage36V

Max voltage (charging)42V

Rated capacity15Ah

Total energy~540Wh

Cell configuration10S

Cell typeLG/Samsung

BMS25A

Protection ratingIP65

Charge cycles800–1000

Dimensions and Construction

Approximate dimensions368x92x90

Approximate weight3.8–4.2 kg

CasingRigid

Mounting systemBracket + key lock

Power connectorXT60

Display and Connectivity

DisplayBuilt-in LCD

IndicatesCharge level

USB portYes

On/off switchWith LED

ChargerIncluded

Why the 10S configuration suits 250W–350W conversions

The 10S configuration means 10 cells connected in series, each contributing around 3.6–4.2V to the pack's total voltage. This delivers the standard 36V used by entry-level hub motor kits, giving a balanced ratio between weight, range and price for everyday riding.

BMS and cell protection

The battery integrates a 25A BMS, built with quality LG/Samsung cells, which monitors voltage, temperature and current per cell in real time, preventing overcharging, deep discharge and cell imbalance. The IP65-rated casing protects against light rain and road splashes in normal use.

Recommendation: the maximum current set on the controller must stay within the BMS discharge limit. An oversized controller can force the BMS into protection mode.

What Type of Conversions It's Recommended For

250W–350W Hub Motors

The 36V voltage matches entry-level hub motor controllers, delivering steady power for daily commuting.

Light Urban Commuting

Compact size and lighter weight make this pack easy to handle for short and medium daily routes.

First DIY Conversion

A straightforward, affordable energy source for a first e-bike build, with no compromise on safety features.

Installation, Maintenance and Safety

Installation Steps

Check dimension compatibility with the down tube
Secure the battery using the mounting bracket
Connect respecting polarity and connector type
Check the LCD before first use

Maintenance

Avoid discharging fully below 20%
Store at 50–70% capacity for long periods
Charge in a ventilated space, never unattended
Avoid temperatures below 0°C or above 40°C

Frequently Asked Questions About the 36V 15Ah Downtube Battery

What range does a 36V 15Ah battery offer?

Range depends on motor power, total weight and terrain type. For 250W–350W systems, estimated range is roughly between 40 and 65 km per charge cycle in mixed urban conditions.

Is the battery compatible with any bicycle frame?

The downtube format fits most standard road, MTB, hybrid and commuter frames using the included mounting bracket. Check down tube clearance before ordering on very small or atypical frames.

How long does a full charge take?

The battery comes with a charger included and reaches a full charge in approximately 4–5 hours.

Can I use this battery with a 48V controller?

No, the controller voltage must match the battery's nominal voltage. For 48V systems, choose one of our 48V downtube batteries instead.