Clark forklift batteries come in a variety of voltages, capacities, and physical dimensions depending on the specific model, capacity class, and battery type (lead-acid vs. lithium-ion). Selecting the correct battery requires matching voltage, amp-hour capacity, and physical footprint to your Clark forklift's specifications. This guide provides a comprehensive reference for Clark forklift battery sizes across popular models and series.
Voltage Options by Model Class
Clark forklifts typically operate on 24V, 36V, or 48V battery systems, with some larger models using 72V or 80V configurations.
Voltage Typical Clark Models
24V TMG15, NPR17, small pallet jacks and walkie stackers
36V ECX-20, TM25, older C-Series electric models
48V C500 Series, GEX Series, S-Series electric forklifts
72V / 80V GEX 50, heavy-duty electric forklifts (4–5 tonnes)
Critical Rule: The battery voltage must exactly match the forklift's electrical system. Using a 48V battery on a 36V system will damage the controller and motor.
Common Clark Forklift Battery Specifications by Model
Clark Model Voltage Typical Capacity (Ah) Battery Type Notes
ECX-20 36V ~400 Ah Lead-acid Older electric model
TM25 36V 625 – 735 Ah Lead-acid Common in mid-range electric
TMG15 24V Varies Lead-acid Smaller walkie/pallet jack
NPR17 24V Varies Lead-acid Narrow-aisle pallet truck
C500 Series (Electric) 48V 400 – 600+ Ah Lead-acid / Lithium Most common Clark electric series
GEX Series (2.5–3.5t) 80V 840 – 930 Ah Lead-acid / Lithium Heavy-duty electric counterbalance
GEX 50 (5.0t) 80V 840 – 930 Ah Lead-acid / Lithium Battery weight: ~2.07 tonnes
Source: LECTURA specs; Clark technical bulletins
Physical Battery Dimensions
Battery size (length, width, height) is as critical as electrical specifications. The battery compartment on each Clark forklift is designed for a specific battery footprint. Always measure the existing battery or battery compartment before ordering.
Battery Type Typical Dimensions (L × W × H) Weight Range
24V / 36V Lead-acid Varies by Ah capacity 600 – 1,200 lbs
48V / 600Ah Lead-acid ~40" × 30" × 24" ~2,500 – 3,000 lbs
80V / 930Ah Lead-acid ~45" × 32" × 26" ~4,500 lbs
80V / 930Ah Lithium-ion Smaller footprint, lighter weight ~2,000 – 2,500 lbs
Important: Lithium-ion batteries typically have 30–40% smaller physical dimensions and 40–50% less weight than equivalent lead-acid batteries. This may require different mounting brackets or compartment modifications.
Battery Capacity and Runtime
Capacity (Ah) Typical Runtime (Single Shift) Best For
400 – 500 Ah 5 – 6 hours Light to medium duty, single shift
600 – 750 Ah 7 – 8 hours Medium to heavy duty, full shift
840 – 930 Ah 8 – 10 hours Heavy duty, multi-shift with opportunity charging
1000+ Ah 10+ hours High-demand, continuous operations
Runtime factors:
Lift height and frequency of lifting
Travel distance per cycle
Load weight and gradeability
Operator driving habits
Battery age and maintenance history
Lead-Acid vs. Lithium-Ion Battery Comparison
Factor Lead-Acid Lithium-Ion (LiFePO4)
Voltage 24V / 36V / 48V / 72V / 80V Same voltage options
Capacity range 400 – 930 Ah 200 – 600 Ah (30–40% lower Ah for same runtime)
Cycle life 1,000 – 1,500 cycles (3–5 years) 2,000 – 5,000 cycles (8–12 years)
Charge time 8–10 hours 1–3 hours
Maintenance Weekly watering, equalization Zero maintenance
Weight Heavy (4,500+ lbs for 80V/930Ah) Lighter (2,000–2,500 lbs)
Physical size Larger footprint 30–40% smaller footprint
Opportunity charging Not recommended Safe and recommended
Common Clark Battery Part Numbers and Replacements
Part Number Voltage Capacity Compatible Models
000906891 36V 725 Ah C500 Series (Yale replacement)
000906883 36V 625 Ah C500 Series (Yale replacement)
1012514 36V 700 Ah Clark TM25, TM30
2355989 24V — Clark NPR17
2538046 24V — Clark TMG15
3928322 48V — Clark GEX Series
Note: Clark sometimes uses batteries from other manufacturers (e.g., GS Yuasa, East Penn, EnerSys). Always verify the battery part number against your specific forklift serial number.
How to Determine the Correct Battery Size
1. Check the Forklift Data Plate
The forklift's data plate lists the required voltage, battery weight, and compartment dimensions.
2. Measure the Battery Compartment
Measure length, width, and height of the existing compartment. Allow for cable connections and venting space.
3. Match the Connector Type
Ensure the battery connector matches the forklift's charging receptacle (e.g., Anderson SBX, SB175, or proprietary connectors).
4. Verify Weight Capacity
The forklift's counterweight and hydraulic system are calibrated for a specific battery weight. Too light or too heavy affects stability and performance.
5. Consult the Service Manual
Clark C500, GEX, and other series service manuals provide detailed battery specifications including:
Required voltage and Ah capacity
Maximum physical dimensions
Battery weight range
Charger compatibility
Where to Buy Clark Forklift Batteries
Authorized Clark dealers – Genuine OEM batteries with warranty
Battery specialists – EnerSys, East Penn, GS Yuasa, Trojan
Forklift parts suppliers – Forkliftpro, Hystersis, Intella Parts
Lithium specialists – BSLBATT, Redway Power, Lithium Battery Power
Used battery suppliers – Verify capacity and cycle life before purchase
Battery Replacement Considerations
Replacement Costs:
24V / 36V lead-acid batteries: $1,500 – $3,500
48V / 600Ah lead-acid batteries: $2,500 – $5,000
80V / 930Ah lead-acid batteries: $4,000 – $8,000
48V lithium-ion batteries: $6,000 – $12,000
80V lithium-ion batteries: $10,000 – $20,000
Signs Battery Needs Replacement:
Capacity drops below 80% of rated Ah
Excessive water consumption (weekly watering required)
Sulfation visible on plates
Swollen or leaking casing
Battery age exceeds 5 years (lead-acid) or 10 years (lithium)
Summary
Clark forklift batteries come in 24V, 36V, 48V, 72V, and 80V configurations. Common capacities range from 400 Ah for light-duty ECX models to 930 Ah for heavy-duty GEX 50 units. Physical dimensions vary significantly: 48V/600Ah lead-acid batteries typically measure approximately 40" × 30" × 24" and weigh 2,500–3,000 lbs, while 80V/930Ah units are larger and heavier. Lithium-ion batteries offer 30–40% smaller footprints and 40–50% less weight than comparable lead-acid batteries. When selecting a battery, match voltage, capacity, physical dimensions, connector type, and weight to your Clark forklift's specifications. Always consult the forklift data plate or service manual, and consider upgrading to lithium-ion for multi-shift operations. Replacement costs range from $1,500 for small lead-acid batteries** to **$20,000 for high-capacity lithium-ion units.