CSB GP12400 12V 40Ah Sealed Lead-Acid Battery

What is the CSB GP12400?

The CSB GP12400 is a 12 V, 40 Ah valve-regulated lead-acid (VRLA) battery with absorbent glass mat (AGM) construction from the CSB GP series (General Purpose). It is sealed and maintenance-free: it never needs water.

CSB designs this series for float service standby power. A flame-retardant case is available on request.

CSB lists this part as a non-stock item, so availability and minimum order quantity are confirmed with your quote.

What are the specifications of the CSB GP12400?

Figures published by CSB in the GP12400 datasheet (2026 edition), with the CSB price list attributes marked:

Nominal voltage: 12 V
Nominal capacity (CSB price list): 40 Ah
Rated capacity, 20-hour rate to 1.75 V/cell, 25 °C: 48 Ah
Rated capacity, 8-hour rate to 1.75 V/cell, 25 °C: 43.6 Ah
Maximum charge current: 12 A
Maximum discharge current: 400 A
Internal resistance: approx. 8.5 mΩ
Terminal: I2 threaded insert for M6 bolt; CSB price list options: B2 or I2/M6
Container: ABS, UL 94-HB; flame-retardant UL 94-V0 case available on request
Flame-retardant case: available on request (CSB price list)
Weight, approx.: 28.48 lb (12.92 kg)
Dimensions (L x W x H): 197 x 165 x 170.4 mm (7.76 x 6.5 x 6.71 in)
Case / group size (CSB price list): M40
Design life: up to 5 years in standby service at 25 °C; Eurobat (20 °C) classification: 3-5 years, standard commercial
Discharge temperature range: -15 to 50 °C
Float charging voltage: 13.5 – 13.8 V per battery at 25 °C (77 °F)
Equalize / cycle charging voltage: 14.4 – 15.0 V per battery at 25 °C (77 °F)
Standards (CSB datasheet): IEC 61056-1/2:2012, UL1973 Listed (MH66728) and UL1989 Recognized (MH14533)

How much power does the CSB GP12400 deliver in a 15-minute discharge?

CSB’s constant-current table gives 85.7 A for 15 minutes to 1.67 V/cell at 25 °C, and the constant-power table gives 939 W per battery to the same end voltage. These are the figures to size a UPS or standby string against a 15-minute runtime.

How do I request a quote for the CSB GP12400?

Request a quote by the part number GP12400. Tell us the quantity you need and, where CSB lists more than one terminal or case option, which one. We confirm price, availability and lead time with the quote.