Trojan 31-AGM · Solar battery 12V 100Ah AGM
Specifications
| Brand | TROJAN |
|---|---|
| Part number | 31-AGM |
| Voltage (V) | 12 |
| Capacity (C20) | 100Ah (c20) |
| Capacity (C5) | 82Ah (c5) |
| Technology | AGM |
| Length | 341.00 mm |
| Width | 173.00 mm |
| Height | 233.00 mm |
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4,79/5★★★★★52 reviewsVerified purchases
- ★★★★Manuel IbaÑez:
Gracias a baterias.com pude elegir la batería más adecudada para mi vehículo
- ★★★★★Jose Miguel Vidal:
Gracias por asesorarme con la instalación de mi batería
- ★★★★★Ruben Mora:
MRW me entregó en menos de un día. Increíble
Trojan 31-AGM 12V 100Ah is a solar battery designed for PV systems with daily charge/discharge cycles. Tolerates extreme temperatures well, with low self-discharge during winter shutdowns or between stays at vacation homes.
Why this solar battery?
- Designed for solar systemsoptimised for daily charge/discharge cycles
- Handles extreme temperaturesin technical rooms or outdoor installs
- Minimal self-dischargewhen left idle over winter or holidays
Voltage
12 V
Capacity
100 Ah
Dimensions
341×173×233 mm
Technology
AGM
Weight
31 kg
Model
TROJAN AGM
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Solar battery Trojan 31-AGM 100Ah 12V
12VVoltage
100AhCapacity
31kgWeight
The 12 V, 100 Ah Trojan 31-AGM solar battery with AGM technology is designed for off-grid photovoltaic installations and storage systems. Measuring 341 × 173 × 233 mm, it is the direct replacement for off-grid PV systems fitted from the factory with a 100 Ah battery of this format.
- AGM: faster recharging and better cycle resistance than a conventional battery.
- Low self-discharge during the darker months.
- Maintenance-free in off-grid installations.
- Compatible with common MPPT and PWM controllers.
What the Trojan 31-AGM is for
With 100 Ah, the Trojan 31-AGM stores the energy from your panels for the night and cloudy days. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 31 kg and 6 terminals.
Technology inside the Trojan 31-AGM
The 31-AGM is one of the Trojan references for this type of use; it shares the same manufacturing and quality-control criteria as the rest of the brand's catalogue.
In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery.
Will it fit your current battery tray?
The Trojan 31-AGM is made in the 341 × 173 × 233 mm format and weighs 31 kg. It uses 6 terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.
Why choose Trojan batteries
Founded in 1925 in California, Trojan invented the golf cart battery and remains the standard in deep-discharge applications that demand thousands of cycles. We guarantee that every Trojan arrives new, charged and with the manufacturer's full warranty.
Usage and maintenance tips
Size the installation so as not to discharge the battery more than 50% daily and set the controller to the battery technology. In the darker months, check the voltage periodically and avoid full discharges.
Manufacturer's warranty
The Trojan 31-AGM comes with the manufacturer's official warranty against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you.
Shipping, delivery and returns
Same-day dispatch from our warehouse for in-stock orders placed before 6:00 pm: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for 14 days if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email.
BCOM-TROJAN-31-AGM
Data sheet
- Brand
- TROJAN
- Reference
- 31-AGM
- Model
- TROJAN AGM
- Voltage (V)
- 12
- Length
- 341.00 mm
- Width
- 173.00 mm
- Height
- 233.00 mm
- Weight
- 31 Kgs
- Technology
- AGM
- Terminal type
- 6
- Capacity (C20)
- 100Ah (c20)
- Capacity (C5)
- 82Ah (c5)
Specific References
- EAN13
- 8404653001537
- MPN
- 31-AGM
4,79/5
Verified purchasesLatest verified reviews
★★★★★Manuel IbaÑez
14/05/2026Su ayuda fue valiosa
Gracias a baterias.com pude elegir la batería más adecudada para mi vehículo
★★★★★Jose Miguel Vidal
04/02/2026Trato y ayuda inmejorable, gracias
Gracias por asesorarme con la instalación de mi batería
★★★★★Ruben Mora
04/02/2026Entregada en tiempo
MRW me entregó en menos de un día. Increíble
★★★★★Cesar Moya
22/11/2025Gracias por su asesoramiento
Gracias a baterias.com pude elegir la bateria más adecudada para mi vehículo
Codes and references Trojan 31-AGM
| Brand | Trojan |
|---|---|
| Manufacturer range | TROJAN AGM |
| Manufacturer reference (MPN) | 31-AGM |
| EAN-13 barcode | 8404653001537 |
| Dimensions (length × width × height) | 341 × 173 × 233 mm (341x173x233) |
Recommended accessories
How to change the battery
Guide to replace a cyclic battery (12V 4-30Ah) for UPS, mobility scooter, alarm or backup device. Estimated time 10-15 minutes. Important: discharge residual voltage before handling.
Step 1. Power off and unplug the device
Unplug the device (UPS, scooter, alarm) and leave it off for at least 30 seconds to discharge residual capacitor voltage. Work on an insulating surface.
Step 2. Locate the battery compartment
Usually under the seat (mobility scooter/wheelchair), in the rear module of the UPS, or behind a side panel with screws. Check the device manual for unusual models.
Step 3. Disconnect the negative (−) first
With insulated gloves, remove the negative (−) cable first. Some UPS have protection fuses — note their position before removing.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Typical weight 1-15 kg depending on capacity. Many cyclic batteries are AGM/GEL — keep them upright. Do NOT invert the battery: even sealed, residue may exist.
Step 6. Fit the new battery
Same orientation and type (AGM, GEL or flooded). Polarity must match the device, not a chassis (this is not a car). Make sure terminals do not touch metal parts of the compartment.
Step 7. Connect the positive (+) first
On cyclic devices the order is reversed compared to cars: positive (+) first, negative (−) afterwards. Tighten without forcing — the plastic terminal housing of cyclic batteries damages easily.
Step 8. Initial charge before first use
Cyclic batteries ship at 60-80%. Before first use, connect the device charger for 8-12 hours (or use an AGM/GEL smart charger if available). This avoids short cycles and extends lifespan.
Frequently asked questions
Is the Trojan 31-AGM an AGM battery and what are the benefits of AGM?
Yes. The 31-AGM from Trojan uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for devices with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions.
How is the Trojan 31-AGM battery installed in the vehicle?
In most devices it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How long does the Trojan 31-AGM battery last?
Expected lifespan of the Trojan 31-AGM is 5 to 8 years in mild-climate device use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the dimensions of the Trojan 31-AGM battery?
Dimensions (length × width × height) are 341×173×233 mm — also written as 341x173x233 mm — following the European DIN standard. Always measure the space in your device before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
What are the equivalents of the 31-AGM model?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop devices. See the "Equivalents" section to view recommended options at the same performance level.
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