Trojan Battery Company 8D AGM Battery Specs & Replacement

Battery and charging

Reserve minutes, at a stated current: 460 minutes at 25 amps
Battery weight: 161 (73)
Nominal capacity: 230 Ah at the 20-hour rate
Capacity, at the 20-hour rate: 230
Capacity, at the 5-hour rate: 179
Capacity, at the 10-hour rate: 210
Reserve capacity: 460
Stated energy: 3.05 kWh

Battery care and safety

Operating temperature range: -4°F to 122°F (-20°C to +50°C)

Size and fit

Length: 520 mm
Width: 270 mm
Height: 231 mm
Terminals: Automotive Post & Stud Terminal DT
Stated weight: 161 lbs, as the quick facts panel states it

Devices documented to run on this

The figures below line up. Neither manufacturer states that this pack runs this device — that is our reading of what each of them published separately, not a claim by either of them or a test by us. Even where every stated figure agrees, these can still decide it:

The device’s published draw is usually a peak, not the load it holds — the two numbers are not the same kind of quantity
A maker’s amp-hour minimum and their reserve-capacity minimum can give different answers about the same battery
Conditions attached to the chemistry, such as a speed limit for running on lithium
Whether the pack may be wired in series at all, where the device needs 24 or 36 volts
The charger, which both makers put conditions on and neither supplies
Case size, hold-down and terminal type — fitting the space is not being secured in it

Worth confirming with the device's manufacturer or a dealer before buying.

Minn Kota's manual for this motor asks for at least a 105 amp-hour rating and says the motor will run on any lead-acid, deep-cycle marine 12-volt battery.

Minn Kota do not say which discharge rate their figure applies to, and Trojan publish four figures for this battery: 179 at the 5-hour rate, 210 at 10, 230 at 20 and 254 at 100.

The 20-hour rate is the conventional marine rating and the one compared.

Minn Kota's website battery guide asks for 110 amp-hours rather than the manual's 105, and they have not reconciled the two; at 230 this battery clears both.

Neither company has named the other and nobody has tested the pairing.

Trojan rate the 8D AGM at 230 amp-hours at the 20-hour rate each, 125 amp-hours above it.

Their amp-hour figure is asked of the battery rather than of the string, so it is compared against a single one.

Source: trojanbattery.com/products/8d-agm-12v-battery

Minn Kota Terrova 55 lb (54" shaft, wireless remote)Figures comparedView device: Minn Kota Terrova 55 lb (54" shaft, wireless remote) →
One of these.
Only on a comparison of two published figures — Trojan's 230 amp-hours at the 20-hour rate against the 105 that Minn Kota's manual asks for — check yours before buying.
Trojan rate the 8D AGM at 230 amp-hours at the 20-hour rate, 125 amp-hours above it. Trojan give 460 minutes of reserve at 25 amps, well below the 50 amps Minn Kota state as this motor's maximum draw, and publish nothing at a higher current. Minn Kota's battery-guidance table recommends AGM or lithium at 100 amp-hours for a 55 lb motor, alongside the manual sentence quoted above.
Minn Kota Terrova 80 lb (60" shaft, wireless remote)Figures comparedView device: Minn Kota Terrova 80 lb (60" shaft, wireless remote) →
Two of these, Two 12-volt batteries wired in series.
Only on a comparison of two published figures — Trojan's 230 amp-hours at the 20-hour rate against the 105 that Minn Kota's manual asks for, and with two of these wired in series as their manual requires — check yours before buying.
Trojan give 460 minutes of reserve at 25 amps, well below the 56 amps Minn Kota state as this motor's maximum draw, and publish nothing at a higher current. Minn Kota's manual for this motor is explicit that two 12-volt batteries wired in series are required. Their battery-guidance table recommends lithium at 100 to 125 amp-hours for an 80 lb motor, which is a different chemistry from this one — the manual and the table are both Minn Kota's and they do not agree.
Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, wireless remote)Figures comparedView device: Minn Kota Terrova 112 lb (60" shaft, CHIRP sonar, wireless remote) →
Three of these, Three 12-volt batteries wired in series.
Only on a comparison of two published figures — Trojan's 230 amp-hours at the 20-hour rate against the 105 that Minn Kota's manual asks for, and with three of these wired in series as their manual requires — check yours before buying.
Trojan give 460 minutes of reserve at 25 amps, well below the 52 amps Minn Kota state as this motor's maximum draw, and publish nothing at a higher current. Minn Kota's manual for this motor is explicit that three 12-volt batteries wired in series are required. Their battery-guidance table recommends lithium at 125 to 150 amp-hours for a 112 lb motor, which is a different chemistry from this one — the manual and the table are both Minn Kota's and they do not agree.

Do not charge with

The manufacturer states these chargers must not be used with this battery:

PD4500LI Series Power Control CenterStated incompatibleView charger: PD4500LI Series Power Control Center →
Progressive Dynamics state it outright about this converter: "The 4500LI series converter/chargers are designed to recharge lithium iron phosphate (LiFePO4) batteries only. DO NOT USE TO RECHARGE LEAD/ACID BATTERIES!" This pack is AGM, which is a lead-acid chemistry, so their sentence covers it. They say nothing about packs of other chemistries and nothing here extends it past what it covers.
Source: forestriverinc.com/files/component-manuals/Electrical/Progressive Dynamics - Power Converter Model PD4500 Series Operation Guide.pdf

Sources

Trojan 8D AGMManufacturer model page
Source: trojanbattery.com/products/8d-agm-12v-battery
Retrieved September 16, 2026
Progressive Dynamics PD4500 Series Operation GuideManufacturer document
Progressive Dynamics
Source: forestriverinc.com/files/component-manuals/Electrical/Progressive Dynamics - Power Converter Model PD4500 Series Operation Guide.pdf
Retrieved September 20, 2026