36V 20.5Ah Downtube E-Bike Battery
Description
36V 20.5Ah Downtube E-Bike Battery – Extended-Range Lithium Pack for 36V Conversions
The 36V 20.5Ah downtube battery steps up the range within the 36V platform, giving commuters and leisure riders extra capacity for longer routes without moving to a higher voltage system. Built around 10 cells in series, it stays compatible with the same 250W–500W controllers as the smaller 36V packs.
The downtube format places the battery along the bicycle's down tube, using a standard mounting bracket and key lock to keep weight low and centred for balanced handling. With 36% more capacity than the 15Ah version in the same voltage class, this pack is the natural upgrade for riders who want noticeably more range without changing their motor or controller setup.
36V 20.5Ah Downtube Battery Technical Specifications
Electrical Parameters
Dimensions and Construction
Display and Connectivity
Why the 10S configuration still suits this higher capacity
The 10S configuration means 10 cells connected in series, each contributing around 3.6–4.2V to the pack's total voltage. The extra capacity here comes from additional cells in parallel rather than a different series count, which keeps the pack fully compatible with the same 36V controllers and motors used across the range.
BMS and cell protection
The battery integrates a 30A 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.
What Type of Conversions It's Recommended For
250W–500W Hub Motors
The 36V voltage matches entry to mid-level hub motor controllers, now with meaningfully more range per charge.
Longer Daily Commutes
Extra capacity for riders covering longer routes who don't want to charge mid-day or carry a spare battery.
Leisure and Weekend Rides
More buffer for longer leisure rides where range anxiety would otherwise limit how far you go.
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 20.5Ah Downtube Battery
What range does a 36V 20.5Ah battery offer?
Is this battery noticeably bigger than the 15Ah version?
How long does a full charge take?
Can I use this battery with a 48V controller?
Details
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What customers are saying
Va multumim pentru review si pentru aprecieri! Ne bucuram ca bateria 36V 20.5Ah a fost exact ce aveati nevoie si ca montajul a decurs usor. Va dorim drumuri placute si va stam la dispozitie oricand aveti nevoie!