Eunorau 52V 17Ah FLASH Third Battery Review

Sold as the third battery for the FLASH e-bikes, this 52V 17Ah pack costs $599 and is described on the page as a Hailong lithium battery. The listing gives a weight of 10.5 lbs, a top tube battery type and a 4A standard charge, and names FLASH and FLASH Lite ST as compatible.

Specifications

Options and pricing

This listing sells one variant at $599, in stock when read, and the table names black as the color. The 4A charger row sits beside a 4A standard charge, and the page does not say if that charger is part of the price. No crossed-out price is shown.

How it compares

The Eunorau 52V 16Ah Main Battery for FLASH E-Bikes is also $599 and the Eunorau 52V 21Ah Secondary Battery for FLASH E-Bikes is $699, so the three FLASH packs run from 16Ah to 21Ah. This 17Ah page states a weight of 10.5 lbs, and the Eunorau 48V 25Ah Reention Dorado ID-MAX Case Battery at $699 is a 48V pack for other bikes.

Shipping, returns and warranty

Shipping: the shipping page says accessories and batteries go by FedEx or UPS in an estimated 5 to 9 days after 1 to 3 business days of processing; orders over $100 ship free and smaller orders pay $14.99, with a possible remote-area charge. If the local warehouse is out of stock, the item ships from an overseas warehouse in an estimated 10 to 15 business days, and there may be no carrier tracking until it reaches the destination country and clears customs. The FAQ gives 15 to 20 days for batteries sent from China. Returns: an order can be cancelled for a full refund before it ships or is produced, but not after it ships; the page asks buyers not to refuse a delivered e-bike and to contact the store instead. A return must be applied for within 7 calendar days of receipt, the product must be new and re-sellable (not assembled, ridden, used or damaged) and complete with its manuals, accessories and original packaging, and the buyer ships it back within 7 days at their own cost to Eunorau's warehouses in the US, Australia, Europe or the UK. The store inspects it within 5 days and refunds in full when the fault is Eunorau's (wrong, damaged or defective item) or minus the shipping cost when the reason is the customer's. The terms page says customers are charged shipping only once, returns included, with no restocking fee, which does not match the return page's wording. Warranty: the warranty page lists 24 months for the battery, covering manufacturing defects only; it is void if the battery's seals are broken, if the wrong or a misused charger was used, or if the battery was used in equipment other than the bike it is specified for. It is for the original purchaser, excludes shipping damage (report it at once with photos or video) and does not cover labor. Disputes under the warranty go to binding individual arbitration (AAA rules, Nevada law) unless the buyer emails an opt-out within 30 days of purchase.

Before you buy

The page shows no customer reviews. Reputation: Eunorau E-Mobility USA Corp has an F grade on the Better Business Bureau, is not BBB accredited and has 2 complaints on file, both marked unanswered: a December 2025 request for proof that a bike sold as new was new, and a May 2025 report of a battery cover that would not latch, which the buyer attributes to a frame defect. A web search on 21 October 2026 found no Trustpilot page for Eunorau. The store says it has specialised in e-bikes since 2009 and designs its bikes in the US and manufactures them in Shanghai, while the BBB lists a business start date of 12 December 2019; the eunorau-ebike.com domain was registered on 27 July 2016.