Separate three questions

  • Riding: what temperatures permit battery discharge?
  • Charging: what conditions does the specified charger require?
  • Long-term storage: what charge level, location and inspection interval does the battery manual specify?

A range listed for riding does not automatically apply to charging. An ideal storage environment and an outer permitted range are different instructions.

A manufacturer example with a defined scope

Shimano’s UM-70F5A-000-00 manual (December 2022) lists BT-E6000-A, BT-E8014-A, BT-E6001-A, BT-E8010-A, BT-E8035-A, BT-E8035-L-A, BT-E8016-A and BT-E8036-A. Its storage section recommends approximately 70% remaining charge and charging every six months to prevent complete depletion, with cool indoor storage around 10–20°C. Its table distinguishes charging 0–40°C and recommended storage −10°C to below 30°C. These are instructions for the listed batteries and revision, not a rule for all Shimano or other brands.

A contrasting Bosch manual example

The Bosch battery manual hosted by Cube, document 0 275 007 3PX dated 8 February 2024, covers CompactTube 400; PowerTube 500, 600, 625, 750 and 800; PowerPack Rack 400 and 500; and PowerPack Frame 400, 545, 725 and 800. Its English page 6 specifies approximately 30–60% charge for storage exceeding three months. Check after six months; recharge to that range if below 30%. For permanently installed batteries, follow the bicycle manufacturer's storage conditions and check charge through the controls/display. This example differs from the listed Shimano manual: match the instructions to your battery instead of choosing a universal percentage.

Make a storage card for your battery

  • Battery model, bike/system generation and manual revision.
  • Manual’s long-term charge target and checking interval.
  • Charging conditions and charger identity.
  • Storage location: dry, protected and consistent with the manual.
  • Owner-permitted removal, handling and reinstall checks.
  • Service contact for unknown instructions or concerning condition.

Do not open the pack or improvise a charger. Read battery warning symptoms, and use the maintenance planner only for reminders based on your own instructions.

When general advice conflicts

Generic manufacturer web articles can cover different products or contain conflicting charge advice. Do not average the numbers. Check the exact battery manual and ask the manufacturer to resolve ambiguity before relying on a storage target.

Manual revisions above are dated examples, not confirmation that they cover your current bike. Check the latest applicable instructions before storing or charging. If a battery is unusually hot, swollen, leaking, smoking or making unusual noises, stop using it; keep away and contact local emergency services if there is an immediate danger. Do not handle a smoking battery.

Frequently asked questions

Is there one storage charge level for every e-bike battery?

No. The guide’s scoped Shimano and Bosch manual examples give different instructions. Match the exact battery and revision to its applicable manual rather than choosing a universal percentage.

Can I use a riding temperature range for charging?

Not automatically. Riding, charging and long-term storage are separate instructions. Check each in the applicable battery and charger manuals.

What should I put on a battery storage card?

Record the battery and system identity, manual revision, charge target, checking interval, charger requirements and storage instructions for that exact model.

What if general advice conflicts with my manual?

Do not average the numbers. Check the exact battery manual and ask the manufacturer to resolve ambiguity before relying on a target.