Taishan vs HS-II Ebike Battery: Capacity, Dimensions, Mounting and Best Use

BATTERY COMPARISON CONTROLLER FIRST, CAPACITY LAST UK + US

The Quick Answer

Choose Taishan if you need 48V, if height under your top tube is tight, or if 1,300 Wh at 52V is enough. Its 386.2 × 97 × 157.4 mm case is the same for all four voltages.

Choose HS-II if you run 52V, your triangle has the height and the removal clearance, and you will use the extra energy: 1,560 Wh against 1,300 Wh, for 7.55 kg against 6.2 kg.

At 60V and 72V both families offer 20Ah, a 60A BMS and the same connectors, so case shape and weight decide.

Taishan vs HS-II Ebike Battery: What Is the Main Difference?

Both are 97 mm thick lithium-ion packs from the same KirbEbike battery range, with a 60A BMS and a matched 5A charger. They differ in four ways: voltage options (only Taishan comes in 48V), capacity at 52V (HS-II stores 20% more), case shape (Taishan is a lower wedge, HS-II a taller tapered triangle) and weight. Pick in this order: controller voltage, controller current, frame fit, then energy.

Taishan vs HS-II at a Glance

From KirbEbike’s collection guide, Taishan and HS-II pages and battery guide, November 2026. Prices change with promotions; see each product page.

Taishan vs HS-II Capacity: Which Stores More Energy?

Stored energy is nominal voltage × amp-hours. On the current variants, HS-II only stores more at 52V; at 60V and 72V the two match.

48V Options: Taishan Has the Clearer Use Case

Only Taishan offers 48V (30Ah, 1,440 Wh, 54.6V at full charge). If your controller is 48V-only, that settles it. Do not move to a 52V pack just to get a different case: a 52V battery reaches 58.8V off the charger, and a controller rated for 48V may not accept it. Our 48V vs 52V compatibility guide explains the check.

52V 25Ah Taishan vs 52V 30Ah HS-II

Charge floor = Ah ÷ 5A from empty; real charging takes longer (see the charging section). Range claims are KirbEbike’s and depend on load, speed and terrain.

The extra 260 Wh is about a fifth more energy for about a fifth more weight, so the packs are almost identical per kilogram. The question is whether you use the extra energy. At 25 Wh per mile, 260 Wh is roughly 10 more miles; at 40 Wh per mile on a hard-ridden high-power build, about 6. Run your own figures in our range calculator, and see the full 25Ah vs 30Ah comparison.

60V 20Ah Taishan vs 60V 20Ah HS-II

On paper these are the same: 20Ah, 71.4V at full charge, 60A BMS, LG 21700 cells, XT90. A full charge of 71.4V means 17 cells in series (17 × 4.2V), which is why KirbEbike lists the 60V packs at 1,260 Wh rather than the 1,200 Wh you get from 60 × 20. With electrics equal, case shape decides it; KirbEbike does not publish separate 60V weights, so check with support if weight matters.

72V 20Ah Taishan vs 72V 20Ah HS-II

Both 72V packs reach 84V at full charge (20 cells in series), store 1,440 Wh and use Samsung 50S 21700 cells. The 50S is a 5,000 mAh-class cell, so a 20Ah pack is four cells in parallel per group (20S4P). Published weights differ: about 6.8 kg for Taishan and about 7.2 kg for HS-II. Matching voltage and Ah does not guarantee identical behaviour, because case layout and heat paths differ, but nothing published separates them electrically. See our 72V battery guide.

Taishan vs HS-II Dimensions: Which One Fits Your Frame?

Taishan Battery Dimensions

Taishan uses one case for every voltage: 386.2 mm long, 97 mm thick and 157.4 mm at its tallest point, tapering at one end. Measure once and every Taishan variant fits the same space.

HS-II Battery Dimensions

HS-II is a tapered triangle, so one height figure is meaningless. KirbEbike’s dimensioned drawing gives each edge: 360.6 mm along the long straight edge, 281.3 mm along the sloped edge, 195.3 mm across the base and 131.6 mm up the short end, at 97 mm thick (frame-fit guide). Some listings round the base to 195.4 mm; make your template from the drawing.

Taishan vs HS-II Dimension Comparison

Taishan is 25.6 mm longer than HS-II’s long edge, but its 157.4 mm height is lower than HS-II’s 195.3 mm and 281.3 mm edges. In practice, Taishan suits frames with a long, low triangle; HS-II suits frames with a taller, more open triangle.

Why Case Dimensions Alone Do Not Confirm Fit

Fit is three checks: the case envelope clears the tubes, the mounting rail lines up with your bottle bosses without pushing the pack into a tube, and the removal path stays clear for the whole slide-off distance (frame-fit guide). Make a full-size cardboard template of the case plus rail and test all three.

Taishan vs HS-II Mounting: Rail, Position and Removal Clearance

Taishan Mounting and Removal Direction

The Taishan is installed in four steps: fixing the base plate to the frame; fastening it with the clamps; sliding the battery onto the base, so that it locks; tightening and locking with the key. Capable of both top and down tube mounting. Since the battery slides on, it will slide off the same way, along the rail, so measure the clearance along the rail, rather than around the seated pack.

HS-II Mounting and Removal Direction

HS-II uses the same four-step bracket system: base plate, clamps, slide-on, key lock. It is also designed to fit in the top tube or down tube. The taller tapered case requires clearance throughout the entire length of the slide path and might still be obstructed by the top tube, which is clear of the seated pack, when it is part way out.

Which Battery Fits Smaller or Tighter Frame Triangles?

Where height under the top tube is the limit, Taishan’s 157.4 mm case has the advantage over HS-II’s taller edges. Where length along the down tube is the limit, HS-II’s 360.6 mm long edge is shorter than Taishan’s 386.2 mm. Neither is a small-frame battery by default; your frame’s tightest dimension decides.

Full-Suspension Frames vs Hardtails

When using a full suspension frame, verify clearance to the rear shock and linkage during full travel (not at rest). Examine bottle-boss position, cable and hose routing, and top and down tubes along the slide path as well. A pack that clears a stationary shock can still meet moving suspension hardware.

Taishan vs HS-II Weight: Does the Difference Matter?

Weight by Variant

Battery only, rail excluded. KirbEbike does not publish separate weights for the 60V packs; the family ranges are 6.2–6.8 kg (Taishan) and 6.4–7.55 kg (HS-II).

More Capacity vs More Weight

At 52V the trade is clean: HS-II adds 260 Wh and 1.35 kg. That buys fewer charging stops on long days. If you rarely use more than 1,000 Wh in a ride, the extra mass and larger case give you little back.

Why Battery Position Matters as Much as Battery Weight

Both packs mount in the main triangle, which keeps their mass low and central rather than high or over the rear wheel. Where you place the plate within the triangle, closer to the bottom bracket or up under the top tube, changes how the weight feels more than the 0.4–1.35 kg difference between the families.

Taishan vs HS-II BMS: Can Both Support the Same Controller?

60A BMS vs Controller Current

Both families list a 60A BMS. The rule is simple: the controller’s maximum battery current must not exceed the battery’s continuous rating. Choose from the controller, not the motor wattage. KirbEbike’s 52V 2000W kit uses a 35A controller, which leaves wide headroom; a 60A controller on a high-power 72V build sits right at the limit. Our BMS amps guide covers the full method.

60A BMS Does Not Mean the Battery Always Outputs 60A

The controller draws the current; the BMS only sets the point at which it cuts the pack off. A 35A controller on a 60A pack draws at most 35A. Keep four figures apart: the BMS continuous rating for sustained load, any short-peak rating, the overcurrent trip point at which the BMS disconnects, and what the cells themselves can deliver. KirbEbike publishes the 60A rating; for anything beyond it, ask support.

Cell Model Matters Alongside the BMS

On the 72V packs the cell model is named, but cell-level current ratings for the 50S differ between sources, so do not add up cell figures to get a pack rating. On the LG 21700 variants KirbEbike names the cell family, not the exact model. Either way, the 60A BMS rating is the number to design to.

Taishan vs HS-II Cells: LG vs Samsung and What Actually Matters

Compare Exact Cell Models, Not Brand Names

“Samsung” or “LG” alone tells you little; both make cells for very different jobs. What matters is the exact model, its capacity and current rating, how many sit in series and parallel, and the finished pack’s current limit. Series count follows directly from full-charge voltage at 4.2V per cell:

72V Variants and Samsung 50S

KirbEbike specifies Samsung 50S 21700 cells for its 72V packs in both families: a 21700-size, 5,000 mAh-class, 3.6V nominal cell. Twenty in series and four in parallel gives 72V × 20Ah = 1,440 Wh.

Taishan vs HS-II Charging: Is 5A Charging an Advantage?

Both Batteries Support a Matched 5A Charger

Both ship with a 5A charger matched to the pack’s full-charge voltage: 54.6V, 58.8V, 71.4V or 84V. The HS-II charger accepts 100–240V AC input. Replacement units are listed as chargers for KirbEbike batteries only.

20Ah vs 25Ah vs 30Ah Charge Time

From empty, a 5A charger cannot finish faster than Ah ÷ 5. Lithium-ion chargers switch to constant voltage near full and the current tapers, so expect a little longer than the floor.

The HS-II page quotes 4–5 hours for “most versions”. The arithmetic rules that out for the 52V 30Ah from empty: allow at least 6 hours. Partial top-ups are proportionally quicker.

Why Charger Connector Fit Is Not Enough

A charger is compatible only if its output voltage, charging profile, polarity and connector all match the pack and its BMS. A plug that fits proves none of those. Use the charger supplied for your pack; UK government guidance and the US CPSC both warn against mismatched chargers (GOV.UK; CPSC).

Taishan vs HS-II for Commuting, Hills, Delivery and High-Power Use

Taishan vs HS-II for Daily Commuting

Work out the energy you use. A 20-mile round trip at 25 Wh per mile is 500 Wh, well inside either pack. Taishan’s lower weight, single case size and easier fit in many frames often matter more here than HS-II’s extra 260 Wh. If you charge at work, smaller still may be fine: see the entry down-tube range.

Taishan vs HS-II for Long-Distance Riding

This is where the 52V HS-II earns its place: 1,560 Wh against 1,300 Wh, if your frame takes the taller case. If it does not, the Taishan 52V 25Ah is the longest-range pack that fits.

Taishan vs HS-II for Hills and Heavy Riders

Hill performance comes from controller current, BMS continuous rating, cell capability and voltage sag, not amp-hours. Both families share the 60A BMS, so neither climbs better on that count. More energy only means you can keep climbing for longer. See can a 52V battery power a 2000W ebike.

Taishan vs HS-II for Delivery and Cargo Bikes

For delivery work, plan around daily distance, charging between shifts and downtime. The HS-II 52V stores the most energy, and its 30Ah needs at least 6 hours at 5A from empty. A pack you can remove makes indoor charging easier, and service matters: within the one-year warranty KirbEbike repairs batteries free of charge in the UK, the US and the Netherlands.

Taishan vs HS-II for 72V High-Power Systems

At 72V the two are electrically matched: 1,440 Wh, Samsung 50S, 60A continuous. On a 60A controller there is no BMS headroom, so heat and sustained full-throttle use deserve care. A 3,000–4,000W build is for private land with the landowner’s permission in the UK; see our 72V battery guide.

Taishan vs HS-II vs Other Ebike Battery Options

Compare Batteries by Specification and Fit

Each seller’s published claims, November 2026.

Two lessons sit in that table. First, packs that look alike can carry very different ratings: Grin states a 60A continuous BMS, names the exact cell and lists UL 2271 certification. Read the continuous figure and the cell model, not the headline. Second, many unbranded triangle packs quote only a peak or “max” current. When a listing gives no continuous figure, or two figures that disagree, use the lower one and ask the seller before you buy.

Which Should You Buy: Taishan or HS-II?

Choose Taishan When...

• You need a 48V pack, or a 52V, 60V or 72V pack in a low case
• Height under your top tube is the tight dimension
• HS-II’s taller outline hits your top tube, shock or slide path
• 1,300–1,440 Wh covers your riding
• Your controller’s maximum battery current is 60A or less

Choose HS-II When...

• Your triangle has the height and the removal clearance
• You will use 1,560 Wh at 52V on long days or delivery shifts
• The extra 1.35 kg is acceptable
• You want the USB-C output and built-in 0–100% gauge
• Your controller’s maximum battery current is 60A or less

Choose Neither When...

• Neither case passes the case, rail and removal checks
• Your controller needs a voltage neither family offers (36V, for example)
• Your controller draws more than 60A continuously
• Your rides use well under 1,000 Wh: a lighter down-tube pack may suit better
• Your frame has no safe central space; a rack format is the answer

Compare the full KirbEbike battery range, including the lighter entry down-tube packs.

Conclusion: Choose by Fit and System Demand, Not Battery Name

Neither Taishan nor HS-II is the better battery. Work through the choice in order: controller voltage, controller current, frame dimensions, rail and removal clearance, the energy you actually use, weight, then charging and service.

The 52V comparison shows the trade clearly. HS-II stores 1,560 Wh against Taishan’s 1,300 Wh, for 1.35 kg more and a taller case. Taishan’s lower 157.4 mm profile is the deciding advantage when height is tight. Measure your frame and check your controller before you order.

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