Rolls-Surrette S12-95AGM

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DISCONTINUED: Rolls-Surrette S12-95AGM deep-cycle 12V AGM battery, 85Ah/20h capacity, 3 years warranty (minimum order qty.)

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SKU: SUR-186-122 Category: Tags: ,

Rolls Surrette has built a solid reputation over the years as one of the best, if not THE best, sources of deep-cycle batteries. Their sealed AGM batteries feature a high cycle life without the need for maintenance. The AGM technology (Absorbed Glass Mat) keeps the electrolyte (acid) contained in the sponge-like glass mats allowing Surrette AGM batteries to not expel any liquids even under severe overcharge. AGM batteries are non-hazardous, resulting in lower shipping costs and they can also be shipped via air. AGM batteries have a very low self-discharge rate, and can handle higher charge currents vs. regular flooded lead-acid batteries.

The AGM line batteries are designed for a variety of maintenance free applications and come with a solid 3 years full warranty. Sealed AGM batteries can be placed anywhere without having to worry about fumes. They are also somewhat more suitable for cold places as they are more frost-proof than regular flooded lead-acid batteries.

Adding batteries in series increases the Voltage, while keeping the Amp-hour size the same. Adding batteries in parallel keeps the Voltage the same, while increasing the Amp-hour size of the battery bank. For example, two S12-95AGM batteries  (85 Ah each) in series makes for a 24 Volt / 85 Ah battery bank. Adding another string of two S12-95AGM batteries in parallel to these will increase the bank size to 24 Volt / 170 Ah.


Recommended Charge Settings (at 25C)

Charge State 12 Volt 24 Volt 48 Volt
Bulk 14.7 Volt 29.4 Volt 58.8 Volt
Absorb 14.7 Volt 29.4 Volt 58.8 Volt
Float 13.8 Volt 27.6 Volt 55.2 Volt
Temperature Compensation: -4mV/°C/cell


Equalize: Do not equalize AGM batteries (or set the equalize Voltage equal to the absorb Voltage)

Absorb time: 0.42 x C / I, where C is the 20-hour battery bank capacity and I is the real-world charge current

For example, a 12 Volt bank of one S12-95AGM battery, 85 Ah battery bank, with 300 Watt in solar PV would have a realistic charge current of around 17.5 Amp in full sun. That makes for an absorb time of 0.42 x 85 / 17.5 = 2.1 hours = 2 hours 5 minutes

End Amps: If instead of time the current is used to determine the end of the absorb cycle, usually called ‘End Amps’, set it to around 2% of C20 (ie. for a 85 Ah battery bank that would be 1.7 Amp as the End Amps setting, when the current falls below this value the batteries are full)

Maximum charge current: 25% of 20-hour battery bank capacity recommended (ie. 0.25 x 85 = 21A for an S12-95AGM battery for example), never more than 35%

Low-Voltage cut-off: 11.1 / 22.2 / 44.3 Volt (corresponds to about 80% Depth-Of-Discharge)



  • 12 Volt maintenance-free VRLA Absorbed Glass Matt battery
  • 85 Ah at 20 hours, 95 Ah at 100 hours discharge rate
  • Terminals are brass automotive posts with M6 threaded inserts
  • Reliable and dependable in an impact resistant plastic housing
  • Rope and molded plastic handle!
  • Three (3) years warranty
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Weight 55 lbs
Dimensions 10.25 × 6.66 × 9.33 in

Mnfr. model

Battery type

Battery Voltage

Amp-hours (20-hour)







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