A 48V 20Ah battery that simply drops into a Lectric XP4.0 downtube with no additional bracket modifications is rare. The H HAILONG pack does just that -- it includes a Hailong-style case, 960Wh capacity, spring-lock mounting mechanism, and a price-per-watt lower than most brand-name batteries at this size. Check current pricing on Amazon.
Specs and Build Quality
The H HAILONG features the classic dolphin-shaped Hailong-style case at approximately 14.4 x 4.6 x 3.8 inches in dimensions, weighing approximately 13.24 pounds. It is designed as a traditional downtube case with a slide-in spring-lock mounting mechanism compatible with all universal Hailong brackets. The case dimensions conform to a traditional Shark/Hailong case, so fitment on any bike with a standard Hailong mounting system is simple.
Specs at a glance:
- Voltage: 48V nominal
- Capacity: 20Ah / 960Wh
- BMS: 40A continuous rating
- Mount: Spring lock slide-in, quick release
- Case: Hailong-style with LED charge indicator
- Weight: 13.24 lb
- Charger: 58.8V 4A fast charger included
The 40A BMS stands out the most. Many of the 48V 20Ah packs available at this price point have a BMS rated at either 25A or 30A, with maximum sustained output ratings typically ranging between 1200 and 1440 watts. The 40A BMS on the H HAILONG allows for motors capable of producing up to 1920W peak. This product is suitable for most 1000-1500W hub motors and high-duty-cycle mid-drive motors. Also included is a fast charger at 4A, since most chargers in this package size typically operate at only 2A.
BMS and Safety Features
The BMS handles overcharge, under-charge, overcurrent, short circuit, and temperature protection. It provides coverage of the basic protections. Due to its specification as a continuous-rated 40A BMS, it provides higher discharge current than nearly all budget-priced Hailong packs (which typically feature a 25-30A BMS), making it better suited for sustaining loads from motors greater than 1000W.
The included slide-in mount has a built-in lock mechanism to secure the battery to the bracket, preventing accidental removal. The ABS case is water-resistant, protecting against splashes and road sprays. However, it is not submersible.
Buyers should take note that this is not a drop-in replacement for stock batteries in most branded ebikes. Although the Hailong bracket style is universal, you will need to attach the included base plate to your frame. Multiple Lectric XP4.0 owners have verified that this battery fits upside down in their stock downtubes using only the three-screw holders.
See how it compares with other packs on our ebike batteries comparison page.
What Amazon Reviewers Are Saying
There are currently two reviews on this product, both five-star. An owner of an XP4.0 ran it in parallel with the stock 17.5Ah battery and stated: "Would recommend to others for more than doubling the range and watt hrs." This means he was able to utilize approximately 1770Wh of total energy between the stock pack and the new pack. For context, that is enough extra range for a full day of riding without needing to stop and charge.
Another buyer installed it on a step-through XP4.0 and said he did not need any additional bracket modifications: "No special bracket needed. There's still room to use the step through without your foot hitting the battery." That is an important detail for step-through riders who worry about clearance issues with larger packs.
Both reviewers used ElectricAllWheel's 40A dual battery balancer kit. If you plan to run two packs, budget accordingly. The balancer makes sure both batteries drain evenly and prevents one pack from working harder than the other. Without it, running mismatched batteries in parallel can lead to premature wear or safety issues.
Who Is This Battery For?
This battery is designed for two types of buyers:
Lectric XP owners who want to double their range. The form factor has been confirmed by multiple buyers to fit inside the XP4.0 downtube, and with a balancer kit you can run it alongside the stock battery for serious capacity.
DIY builders in need of a standard Hailong size with a 40A BMS. Most universal Hailong packs top out at 25A. This one clears 40A, which matters for 1500W hubs and high-discharge mid-drives.
Budget-conscious range seekers -- at a very affordable per-watt cost, this is one of the cheapest 48V 20Ah packs available on the market. The trade-off is that it comes from a relatively unknown brand with only two customer reviews so far.
For more reviews and guides, check out our blog home.
Frequently Asked Questions
Does the H HAILONG 48V 20Ah fit the Lectric XP4.0?
Yes. Multiple buyers verified that it fits inside the downtube of the XP4.0 using the stock three-screw holders. Mounting works upside down inside the frame triangle. The battery slides in from the bottom and locks into place with the spring-lock mechanism. No drilling or extra hardware is needed if your bike already has the three-screw mounting pattern. If your bike does not have that pattern, you can install the included base plate in a few minutes with basic tools.
What type of BMS does this battery use?
A 40A BMS. That is higher than most budget-priced Hailong packs and supports motors up to approximately 1500-1920W peak. The continuous rating means it can handle sustained loads without thermal throttling, which is important if you ride uphill for extended periods or weigh more than average.
Does this battery include a charger?
Yes. It includes a 58.8V 4A fast charger. That is twice the amperage of many stock ebike chargers.
Can I run this battery in parallel with my stock battery?
Yes, but you will need a dual battery balancer kit -- at minimum a 40A unit. Multiple Lectric XP4.0 owners recommend using ElectricAllWheel's 40A balancer. A balancer makes sure both packs discharge at the same rate so one does not get overloaded while the other sits idle.
What form factor is this -- downtube or Hailong?
It is a Hailong-style case that slides into a universal downtube bracket. Fitment depends on whether your bike has a standard Hailong mount.
How many charging cycles will this battery support?
The listing claims 1000+ cycles with over 80% capacity retention using Grade A cells. For daily commuters, that typically translates to 3-5 years of use depending on how often you ride and how deeply you discharge the pack. If you charge once per day, you are looking at roughly three years before noticeable capacity loss. Keeping the battery between 20% and 80% charge and storing it in a cool place can help extend its usable life even further.
Does the H HAILONG work with 52V systems?
The listing shows options for 36V, 48V, and 52V configurations. Make sure to order the correct voltage for your motor and controller.