Two Lithium Hellas 52V 20Ah batteries ordered together will also change the calculation three ways: a larger backup capability by Day 1, a dual-battery range option, and a cheaper "per unit" price than purchasing separate units. Although the trade-off is real, if you don’t actually use the second battery for its intended purpose, then the extra weight of that second battery may become costly dead weight.
Although Lithium Hellas is a new name to most ebike riders, they do have a large number of 52V battery entries in Amazon’s database, and some of their 52V battery products have many good reviews.
Why Get a 2-pack?
Two 52V 20Ah packs in one order change the math. Backup on day one, dual-battery range, lower per-unit price.
There are several reasons why someone might choose to get a 2-pack of ebike batteries. These include:
Dual-battery setup: There are some ebike conversion kits that allow the connection of two batteries in series. With two 52V 20Ah packs connected in series, total capacity increases to 40Ah (2080 Wh), but still remains at 52V. A dual-battery setup provides ebike riders longer ranges and greater flexibility for heavy loads such as cargo hauling or long distance touring.
Swap rotation: Riders who need more power than can be provided by a single pack can switch to a fully charged secondary pack after the first 30-40 miles. After using up the energy in the secondary pack, the primary pack is again switched back into service. This method provides additional range over what a single charge would provide.
Backup/redundancy: When a rider has two packs, a failed or failing primary pack does not leave them stranded. They can simply move to the secondary pack until they can replace the primary pack. Because there is always a secondary pack available, it eliminates the inconvenience of waiting for the replacement part to arrive.
Multi-bike/multi-rider fleet operation: Any ebike builder looking to operate multiple ebikes or to allow multiple riders on the same bike model should seriously consider getting two identical packs from the same manufacturer. It provides a commonality among all of the bikes and/or riders, regardless of whether they ride one bike or multiple bikes, and is especially important if all of the bikes are going to be ridden under similar conditions.
Planning ahead for battery replacements: All ebike lithium ion batteries gradually lose capacity as they age. By having two packs, ebike builders can simply rotate through both packs as each loses capacity. Instead of being forced to wait until the primary pack reaches zero percent state of charge and then waiting 1-2 weeks for the replacement part to arrive via shipping, the replacement transition is now instant. For ebike riders who rely heavily on their ebikes for transportation and therefore cannot afford to be without an operational vehicle for extended periods, this continuity has great value.
Specs Per Unit
As previously stated, each of the two packs includes 52V x 20Ah = 1040Wh. At 52V and a rating of 30 amps, the BMS limits the continuous power handling capability to 1560 W. Most ebike motors fall within the 750W to 1500W range, which is well within the maximum continuous power capability of the 30 amp BMS. Therefore, if you’re operating in this range, it is likely you’ll have plenty of headroom between your ebike motor’s actual power draw and the maximum sustainable capability of the BMS.
In terms of connectors, the T-Plug connector shown in these photos is a very common and widely-used connector found in mid-powered ebike systems. However, if your ebike controller utilizes a different connector type (e.g., XT60, Anderson Powerpole, etc.), there are many affordable and easy-to-find T-Plug to XT60 adapters available online.
In addition to adapters for converting T-Plugs to alternate types (i.e., XT60), parallel adapter cables specifically made for use with T-Plug connectors are also readily available if you decide to implement a parallel dual-battery configuration.
Lithium Hellas Brand Background
While Lithium Hellas may be a relatively unknown name to most ebike enthusiasts currently shopping for batteries online, they have built a reputation as one of Amazon’s top-selling brands for 52V battery-related products. The Lithium Hellas website lists numerous products related to batteries in general as well as products related to ebikes specifically. As indicated above, they specialize in producing high-quality 52V battery-related products. Specifically, they offer products that cater to various ebike components including e-brakes, throttles, chargers, wiring, lights and accessories as well as high-capacity battery cells and complete packs. Furthermore, they provide customers with high-quality, reliable products combined with excellent customer service and competitive pricing.
Advantages of US-Based Inventory
Who This Two-Pack Is For
Compare it against the full battery table before ordering.
This bundle suits high-drain builds and riders who never want to be stranded.
Consumers best suited to purchase this product include:
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Consumers interested in establishing dual-battery parallel configurations: For consumers wishing to establish dual-battery parallel configurations, using two identical packs allows doubling effective capacity (while maintaining the same voltage).
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Consumers requiring backup capacity for their ebikes: Consumers who wish to have backup capacity available immediately should also consider purchasing two identical packs. Once one pack begins losing its ability to maintain charge due to normal degradation over time, consumers can easily switch to their redundant pack.
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Consumers managing fleets of ebikes: Fleet managers benefit from having identical packs from the same manufacturer, as this minimizes variability and promotes compatibility across all bikes managed by the fleet.
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Consumers splitting cost sharing arrangements: Consumers purchasing two identical packs with fellow ebikers will realize greater cost-sharing opportunities while ensuring compatibility across multiple ebikes.
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Consumers desiring reduced lead times for replacement parts: Consumers experiencing failures with either pack can quickly obtain replacement parts by utilizing their pre-existing redundant packs, eliminating delays associated with awaiting delivery from abroad.
To view prices and read recent buyer reviews on Amazon go here.
FAQ
Will running both packs in parallel on my ebike work?
Provided your ebike controller has provision for connecting two battery packs in parallel (which some controllers do natively, others require adapters) you can connect both packs in parallel and double effective capacity while keeping voltage constant (if applicable).
Are both packs included in the purchase supplied from the same batch?
With most manufacturers supplying batteries as part of a package deal, unless otherwise specified, both packs included in a package deal will generally originate from the same batch. The similarity in cell characteristics between both packs will help ensure even performance when utilized alternately in a swap-rotation mode or in parallel.
What is T-Plug connector used for?
The T-Plug connector shown in images serves as an output connector that interfaces between your ebike controller and your battery pack(s). While some controllers utilize XT60s or Anderson Powerpoles, there are numerous inexpensive and commonly-found T-Plug-to-XT60 adapters online. For implementing parallel dual-battery configurations, use parallel harnesses specifically designed for your power levels.
Is a 30A BMS sufficient for my 1500-watt ebike motor operating at 52V?
At 52V, a continuous current limit of 30A equates to approximately 1560 watts. Assuming your motor operates at around four percent headroom above its maximum continuous wattage rating, there should be sufficient reserve power for light-duty climbing activities. Conversely, if you anticipate engaging prolonged heavy-duty climbing activity with your motor (such as climbing steep mountains), you may find yourself closer to reaching your BMS’s maximum continuous current limitation. Ultimately, this depends upon how aggressively you climb during prolonged intervals.
Why would I want US-based inventory versus direct shipping?
Using domestically-sourced inventory means your shipment will typically reach you within two-five business days versus taking weeks if you select direct shipping from overseas. Secondarily, domestically-sourced inventory generally offers easier return experiences since you won’t have international shipping complexities to contend with.
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