Trojan OverDrive AGM 31 · Solar battery 12V 102Ah AGM
Specifications
| Brand | TROJAN |
|---|---|
| Part number | OverDrive AGM 31 |
| Voltage (V) | 12 |
| Capacity (C20) | 102Ah (c20) |
| Capacity (C5) | 84Ah (c5) |
| Technology | AGM |
| Length | 341.00 mm |
| Width | 173.00 mm |
| Height | 234.00 mm |
€585.95
VAT included
4,78/5★★★★★32 reviewsVerified purchases
- ★★★★★Marc Guerrero:
Pedí la batería un viernes a las 4 y me llegó el lunes a las 11
- ★★★★★David Pascual:
Compre la TROJAN OVERDRIVE AGM 31 y llamé para que me ayudaran con la instalación. Muy buena asesoría
- ★★★★★Enrique Garrido:
Recomiendo esta web, excelente servicio
Trojan OverDrive AGM 31 12V 102Ah 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
102 Ah
Dimensions
341×173×234 mm
Technology
AGM
Weight
31 kg
Model
TROJAN AGM RELIANT
Solar battery Trojan OverDrive AGM 31 AGM Reliant 102Ah 12V
12VVoltage
102AhCapacity
31kgWeight
The 12 V, 102 Ah Trojan OverDrive AGM 31 solar battery from the AGM Reliant range with AGM technology is designed for off-grid photovoltaic installations and storage systems. It measures 341 × 173 × 234 mm, the format sought by anyone replacing a 102 Ah battery in off-grid PV systems.
- Long life on float and moderate cycling.
- Good tolerance to extreme temperatures.
- Optimised for daily charge and discharge cycles.
- AGM technology: absorbed electrolyte, no spills, can be mounted at an angle.
What the Trojan OverDrive AGM 31 is for
The Trojan OverDrive AGM 31 is designed for off-grid photovoltaic installations and storage systems. Size the capacity so as not to discharge more than 50% daily and you will greatly extend its life. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 31 kg and 11 terminals.
Size, terminals and hold-down of the Trojan OverDrive AGM 31
In terms of format, the Trojan OverDrive AGM 31 measures 341 × 173 × 234 mm (length × width × height) and weighs 31 kg. It uses 11 terminals, the system that anchors and connects it in the vehicle. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery.
The Trojan OverDrive AGM 31: AGM Reliant range and AGM technology
The AGM Reliant is the Trojan range the OverDrive AGM 31 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle.
AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery.
Trojan: the maker behind the OverDrive AGM 31
Founded in 1925 in California, Trojan invented the golf cart battery and remains the standard in deep-discharge applications that demand thousands of cycles. All the Trojan batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
Manufacturer's warranty
The Trojan OverDrive AGM 31 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.
How to make it last longer
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.
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-OVERDRIVE AGM 31
Data sheet
- Brand
- TROJAN
- Reference
- OverDrive AGM 31
- Model
- TROJAN AGM RELIANT
- Voltage (V)
- 12
- Length
- 341.00 mm
- Width
- 173.00 mm
- Height
- 234.00 mm
- Weight
- 31 Kgs
- Technology
- AGM
- Terminal type
- 11
- Capacity (C20)
- 102Ah (c20)
- Capacity (C5)
- 84Ah (c5)
Specific References
- MPN
- OverDrive AGM 31
4,78/5
Verified purchasesLatest verified reviews
★★★★★Marc Guerrero
27/01/2026Me sacarón de un apuro, entrega en menos de 24 horas
Pedí la batería un viernes a las 4 y me llegó el lunes a las 11
★★★★★David Pascual
20/01/2026Gran asesoría
Compre la TROJAN OVERDRIVE AGM 31 y llamé para que me ayudaran con la instalación. Muy buena asesoría
★★★★★Enrique Garrido
17/01/2026Muy bueno
Recomiendo esta web, excelente servicio
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 OverDrive AGM 31 model AGM? What does this technology offer?
Yes. The OverDrive AGM 31 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 do I change this battery step by step?
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 OverDrive AGM 31 battery last?
Expected lifespan of the Trojan OverDrive AGM 31 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 size is this battery?
Dimensions (length × width × height) are 341×173×234 mm — also written as 341x173x234 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.
Which batteries are equivalent to the Trojan OverDrive AGM 31?
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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