CSB EVX12400 12V 40Ah deep cycle AGM battery, group M40, I2 threaded insert
CSB EVX12400 12V 40Ah deep cycle AGM battery, group M40, I2 threaded insert

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CSB EVX12400 12V 40Ah Deep Cycle AGM Battery

$133.95
SKU: EVX12400
Availability: Shipping Lead Time is 2 to 3 Business Days
Shipping: Free shipping on orders $75 and up
Voltage: 12
Capacity: 40.00 Ah (20-hour rate to 1.75 VPC at 25C); 31.52 Ah at the 8-hour rate
Chemistry: AGM VRLA, pure lead construction
Terminal: I2 threaded insert, M6 bolt, 44.9 +/- 9.0 lbf-in (price list records B2 / I)
Features: High Cycle series, group M40, e-mobility and deep cycling duty, non-stock line
Dimensions: 7.76 x 6.50 x 6.71 in (L x W x H)
Cycle Life: 400 cycles at 100% DOD; 1,800 cycles at 30% DOD, both at 25C
CSB EVX12400 12V 40Ah Deep Cycle AGM Battery

CSB EVX12400 12V 40Ah Deep Cycle AGM Battery

$133.95
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Description  

CSB EVX12400 Battery - 12V 40Ah Deep Cycle AGM, Group M40

The EVX12400 is rated 40.00 amp hours at the 20 hour rate to 1.75 volts per cell at 25°C, and that figure lands exactly on the part number with nothing rounded in either direction. CSB builds the EVX range for repeated deep discharge rather than for standby, so the number that decides cost over the life of the pack is cycles: 400 at 100 percent depth of discharge and 1,800 at 30 percent, both measured at 25°C. Working those against each other shows why shallower use pays: four and a half times the cycle count for three tenths of the energy each time, which is roughly 1.35 times the total energy delivered before the pack is done. Stepping up to the EVX12520 buys 12 more amp hours in a group 22NF case, and stepping down to the EVX12340 gives up 6. The block runs 29.07 lbs in a case 7.76 by 6.50 inches standing 6.71 inches tall, on an I2 threaded insert that takes an M6 bolt, with 8.2 milliohms of internal resistance.

Warranty

Warranty. CSB gives 1 year on the EVX High Cycle range. Design life is a separate figure: 8 years per the CSB price list, measured at 25°C (77°F). Country of origin is Vietnam. Terms are confirmed in writing with your quote.

Built for Cycling, Rated in Amp Hours

40.00 Ah at the 20 hour rate
To 1.75 volts per cell at 25°C, which is the badge exactly, with 31.52 Ah at the 8 hour rate and 30.56 Ah at 8 hours to 1.80.
1,800 cycles at 30 percent DOD
Against 400 cycles at a full 100 percent, both at 25°C. The depth you design for moves the cycle count further than anything else on this sheet.
400 amps for 5 seconds
The published peak discharge, with 1,082 amps of short circuit current behind it, which is what a controller inrush or a motor start draws against.
  • No float charging voltage is published - CSB prints a dash in that row for the EVX range, so this is not a block CSB rates for permanent float standby; the equalization window is 14.4 to 15.0 VDC per battery at 25°C.
  • Built to IEC 60254-1:2005 and IEC 60254-2:2008 - the lead acid traction standards, where CSB's UPS ranges are built to the stationary standards instead.
  • 12.00 amps maximum charge current - the recharge ceiling per block, and what sets how long a pack is off the floor between runs.
  • 37.0 amps over 30 minutes to 1.67 volts per cell - falling to 22.3 amps over an hour and 2.12 amps across the full 20 hour rate.
  • Storable 6 months at 25°C, or 10 months with an equalization charge - self discharge stays under 10 percent over 90 days, and a full recharge is required before the block goes into service.

Technical Specifications

CSB EVX12400 Specifications
Part NumberEVX12400 (also written EVX 12400, EVX-12400 and evx12400)
SeriesEVX, High Cycle, 12 volt top terminal
Battery TypeAGM, valve regulated lead acid (VRLA), pure lead construction
Nominal Voltage12V
Capacity, 20 Hour Rate40.00 Ah to 1.75 VPC at 25°C
Capacity, 8 Hour Rate31.52 Ah to 1.75 VPC at 25°C; 30.56 Ah to 1.80 VPC
Cycle Life400 cycles at 100 percent depth of discharge; 1,800 cycles at 30 percent, both at 25°C
Discharge Current, 30 Minutes37.0 A to 1.67 VPC at 25°C (444 W per block)
Discharge Current, 60 Minutes22.3 A to 1.67 VPC at 25°C (268 W per block)
Maximum Charge Current12.00 A
Maximum Discharge Current400 A over 5 seconds
Short Circuit Current1,082 A
Internal ResistanceApproximately 8.2 milliohms
Terminal TypeI2 threaded insert to accept an M6 bolt per the CSB datasheet; the CSB price list records the standard terminal for this part as B2 / I, so confirm the terminal with your quote
Terminal Torque44.9 ± 9.0 lbf-in (5.1 ± 1.0 N·m)
Length7.76 ± 0.08 inches (197.0 ± 2.0 mm)
Width6.50 ± 0.08 inches (165.0 ± 2.0 mm)
Height6.71 ± 0.08 inches (170.4 ± 2.0 mm)
Weight29.07 lbs (13.20 kg)
BCI Group SizeM40 (CSB price list)
Float Charging VoltageNot published by CSB for the EVX range
Equalization Charging Voltage14.4 to 15.0 VDC per battery at 25°C (77°F)
Operating TemperatureNominal 25°C (77°F); discharge -15°C to 50°C (5°F to 122°F); charge and storage -15°C to 40°C (5°F to 104°F)
Self DischargeLess than 10 percent after 90 days at 25°C; storable 6 months, or 10 months with an equalization charge
Container MaterialABS (UL 94-HB); the CSB price list leaves the flame retardant column blank on this part, which puts the 94-V0 case in the available-on-surcharge category rather than standard
StandardsIEC 60254-1:2005 and IEC 60254-2:2008; UL1973 Listed (MH66728); UL1989 Recognized (MH14533); TUV NORD to ISO 9001:2015
Design Life8 years at 25°C per the CSB price list; the per-part datasheet states cycle life instead of years
Warranty1 year (CSB, EVX High Cycle range)
Country of OriginVietnam
Technical Documentation
CSB EVX12400 datasheet, 2026 (PDF)

Where This Battery Is Used

  • Personal mobility and medical transport - powered wheelchairs and scooters, the duty CSB names first for this range, where the pack is emptied and refilled on a daily rhythm.
  • Small electric vehicles and motorsports - utility EVs and light electric drivetrains that run a pack down over hours rather than minutes.
  • Floor machines and powered work equipment - scrubbers, sweepers and lifts sized on amp hours per shift and judged on how many shifts the pack survives.

Ordering and Freight

The EVX12400 is a non-stock line, so quantities are confirmed with a lead time rather than shipped from the shelf. At 29.07 lbs a single block moves by parcel carrier and a multi-block pack palletizes to LTL. Freight sets ship pre-paid to a commercial address, and a residential or limited-access delivery adds $100, the liftgate and access charge the carrier passes through. Send the block count, the pack voltage, your delivery ZIP and the date it has to be on site, and a specialist returns volume pricing, lead time and freight in writing in 24 to 48 hours.

Frequently Asked Questions

Can this go in a UPS?

We would steer you elsewhere. CSB publishes no float charging voltage for the EVX range, which is the figure a UPS depends on because the battery sits at full charge continuously for years between events. The EVX sheet gives an equalization window and a cycle count instead, and it is built to IEC 60254, the traction standard. For float standby duty the HR, HRL and XHRL ranges are the ones CSB rates for it, and they publish the float window and the watts-per-cell figures a UPS string gets sized on. Tell a specialist what the battery is powering and you will get pointed at the right family rather than the nearest amp hour match.

What do 400 cycles and 1,800 cycles translate to in practice?

They bracket the same battery at two working depths. Run it flat every time and CSB expects about 400 discharges from it. Take it down 30 percent and stop, and it expects roughly 1,800. The second case delivers more total energy over the life of the block, about 1.35 times as much on the published figures, and it takes four and a half times as many cycles to get there. The practical reading is that a pack sized generously and cycled shallow outlasts a pack sized tightly and cycled hard, which is the usual argument for buying one size up.

Is 40 amp hours the real measured capacity?

Yes, and that is not true of every CSB range. The datasheet gives 40.00 Ah at the 20 hour rate to 1.75 volts per cell, so the part number and the measurement agree to two decimal places. CSB's UPS ranges badge on watts per cell instead and their labels sit a few percent under the measurement. At the 8 hour rate this block gives 31.52 Ah, which is the figure to use if your duty empties the pack in a working shift rather than over a day.

Which terminal does it come with?

Confirm it on the quote, because CSB's two documents describe it differently. The per-part datasheet specifies an I2 threaded insert taking an M6 bolt at 44.9 lbf-in, plus or minus 9.0. The CSB price list records the standard terminal for this part as B2 / I. Those describe different hardware, and on a 40 Ah mobility block the terminal decides if an existing harness bolts straight on. Send a photo of the connection you are replacing with your quote request and a specialist confirms the build against CSB before anything ships.

Next size up: CSB EVX1252052 Ah at the 20 hour rate in a group 22NF case, for packs that need the extra run between charges.
Sizing a deep cycle pack?

Send the pack voltage, the amp hours you draw per shift and the block that is in there now. A specialist works it against the cycle figures and quotes it with lead time in writing.

Call 1-877-775-4381  ·  battery specialists, not a call center

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov (State of California only).

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