🔋 Compact Bottle E-Bike Battery LG 18650 3.7V 3500mAH — 36V & 48V Options
This listing is available in three variations:
36V 7Ah — Small 230mm battery case.
36V 10.5Ah — Medium 300mm battery case.
48V 7Ah — Medium 300mm battery case.
A small, lightweight and compact bottle-style e-bike battery designed for riders who want a neat and easily removable power solution without fitting a large, heavy battery to the bicycle.
Its compact aluminium case makes it easy to remove from the bike, carry in a backpack and take indoors for charging or secure storage. It is an ideal match for many 250W and 350W DIY e-bike conversion kits.
Lightweight commuter conversions • Folding bikes • Compact bicycle frames • Riders who need easy battery removal • Short and medium-distance journeys
📦 Available Battery Variations
Please select your required voltage and capacity carefully before ordering.
🔹 36V 7Ah — 230mm Case LG18650 3.7V 3500mAH
- 36V nominal voltage
- 7Ah capacity
- Approximately 252Wh stored energy
- Compact battery length of approximately 230mm
- The smallest and lightest option in this listing
🔹 36V 10.5Ah — 300mm Case LG18650 3.7V 3500mAH
- 36V nominal voltage
- 10.5Ah capacity
- Approximately 378Wh stored energy
- Battery length of approximately 300mm
- Offers more capacity and expected range than the 36V 7Ah model
🔹 48V 7Ah — 300mm Case LG18650 3.7V 3500mAH
- 48V nominal voltage
- 7Ah capacity
- Approximately 336Wh stored energy
- Battery length of approximately 300mm
- Suitable for compatible 48V conversion systems
A 36V battery must only be used with a compatible 36V controller and system. A 48V battery must only be used with a compatible 48V controller and system. Please check your controller voltage before ordering.
✨ Small, Lightweight & Compact Design
- Designed to take up less space than a traditional large downtube battery
- Easy to remove from the bicycle when parking or storing the bike
- Compact enough to carry in many backpacks
- Convenient for charging indoors, at work or away from the bicycle
- Ideal for riders who prioritise low weight and compact size over maximum range
- Neat bottle-style mounting system for a tidy installation
🔋 Grade A LG18650 3.7V 3500mAH
- Built using Grade A LG 18650 lithium-ion cells
- Reliable cell performance and consistent power delivery
- Designed for repeated charging and everyday e-bike use
- Battery-management system protects and monitors the cell pack
⚡ 20A Battery-Management System
- 20A BMS fitted inside the battery
- Provides over-current protection
- Provides over-charge protection
- Provides over-discharge protection
- Provides short-circuit protection
- Best suited to lower-powered 250W and 350W conversion kits
🚲 Motor & Controller Compatibility
- Recommended for many 250W and 350W e-bike conversion kits
- 36V batteries require a compatible 36V controller
- 48V batteries require a compatible 48V controller
- 20A BMS rating must be considered when checking controller compatibility
Motor wattage alone does not confirm compatibility. The controller voltage, maximum current, connector type and polarity must also be checked.
🔌 Connections & Charging
- Supplied with a 30cm discharge cable
- XT60 discharge connector
- One-pin 2.1mm DC charging port
- 2A UK battery charger included
- Battery can be removed from the bike for convenient indoor charging
📱 5V 1A USB Charging Port
- Built-in 5V 1A USB output
- Can be used for charging compatible phones
- Suitable for many bicycle lights and small USB accessories
- Can power or recharge some portable speakers and navigation devices
USB charging will use energy from the battery and may slightly reduce the available riding range.
🎛️ Power Button & Charge Indicator
- Integrated on/off power button
- Built-in charge-level indicator gauge
- Quickly check the approximate remaining battery level
- Convenient controls positioned directly on the battery case
🛡️ Aluminium Case & Water Resistance
- Strong aluminium outer casing
- Helps protect the internal battery cells during normal use
- Water-resistant design suitable for normal riding in the rain
- Designed for everyday commuting and recreational riding
The battery may be used during normal wet-weather riding, but it must never be submerged in water, pressure-washed or left exposed to standing water. Always keep the charging port and electrical connectors clean and dry.
📏 Battery Dimensions
- 36V 7Ah battery length: approximately 230mm
- 36V 10.5Ah battery length: approximately 300mm
- 48V 7Ah battery length: approximately 300mm
Please measure the available space on your bicycle before ordering. Allow additional clearance so the battery can be inserted into and removed from its mounting holder.
🛣️ Estimated Riding Range
Depending on the selected model and riding conditions, the expected riding range is approximately 10–30 miles per charge.
- The 36V 7Ah model provides the lowest capacity and shortest expected range
- The 36V 10.5Ah model provides the highest capacity in this listing
- The 48V 7Ah model provides 48V compatibility in a compact format
- Pedal-assist use normally provides better range than continuous throttle use
- Lower assistance levels can increase the distance available from one charge
Actual range depends on rider weight, terrain, hills, wind, tyre pressure, temperature, stop-start riding, controller current, assistance level and throttle use. Range figures are estimates and cannot be guaranteed.
📦 What’s Included
- Selected bottle-style e-bike battery
- Matching battery mounting holder/base
- 2A UK battery charger
- 30cm discharge lead
- XT60 discharge connector
- Integrated 5V 1A USB charging port
- Integrated on/off button
- Integrated battery charge indicator
✅ Quality, Testing & Certification
- Built using Grade A LG cells
- Battery pack is quality checked before dispatch
- Designed and manufactured to meet applicable battery safety and transport requirements
- Supplied with a compatible charger for the selected battery voltage
Certification and test documentation relates to the battery model and manufacturing specification. The purchaser remains responsible for ensuring the battery is compatible with their particular bicycle, controller and intended use.
🔧 Installation & Frame Fit
- Designed to mount around the bicycle's bottle-cage area
- Compact shape helps it fit a wider range of frames than many larger batteries
- Battery is removable from the mounting holder
- Frame size, tube shape and bottle-boss position can affect compatibility
⚠️ Lithium Battery Safety
Lithium-ion batteries must be used, charged and stored responsibly.
- Only use the charger supplied for the selected battery
- Never leave the battery charging unattended
- Charge on a hard, dry and non-flammable surface
- Do not use a damaged battery, charger or cable
- Do not open, crush, puncture or modify the battery case
- Do not expose the battery to extreme heat or open flames
- Do not submerge the battery in water
- Allow the battery to cool before charging after a demanding ride
- Store partially charged in a cool, dry place when not used for long periods
🚚 Shipping
- Orders are normally processed Monday to Friday
- Tracking information is provided after dispatch
- Lithium batteries must be shipped using approved battery transport services
- Delivery times may vary depending on location and courier restrictions
↩️ Returns
- Returned batteries must be complete and include all supplied accessories
- Unused returns must be returned in their original condition and packaging
- All returned batteries are inspected and tested before a refund is processed
- Please contact us before returning any lithium battery so the correct return process can be followed
🤝 Need Help?
If you are unsure about voltage, controller current, connector compatibility, frame fit or which capacity is best for your riding needs, please contact us before ordering. Sending clear photographs of your bicycle, controller label and existing battery connection will help us advise you.