Trojan Motive T-875 170Ah 8V Flooded ELPT Deep-Cycle Battery with Bayonet Cap
Pickup on Wed, Dec 17 from Ft. Myers, FL
Delivery on Dec 22–26
Trojan Motive T875-AES 158Ah 8V AGM M8 Deep-Cycle Battery
Pickup on Wed, Dec 17 from Miami, FL
Delivery on Dec 22–26
The 8-volt battery is the optimal choice for 36-48 volt systems in golf carts, floor scrubbers, and electric vehicles. This format delivers 15-20% longer service life compared to 6V alternatives while reducing connection complexity versus 12V configurations.
The 8V format reduces series connection points by 33% compared to 6V systems while maintaining superior charge balance versus 12V units. A 48V system needs only six 8V batteries with five connections, compared to eight 6V batteries requiring seven connections—fewer failure points in demanding environments.
Each 8V battery contains four 2V cells. With 24 total cells in a 48V system (versus 32 cells using 6V batteries), you get fewer potential weak points. Trojan data confirms 18% longer cycle life for 8V configurations at 50% depth of discharge.
Flooded lead-acid: $185-275, 170-225Ah capacity, 800-1200 cycles. Requires monthly water additions and quarterly 9.6V equalization. Best for daily-use applications with maintenance access.
AGM (Absorbed Glass Mat): $240-350, sealed maintenance-free design. Prevents spills, allows any-orientation mounting. Delivers 900-1300 cycles—ideal for enclosed equipment or marine use.
Lithium LiFePO4: $750-1400, delivers 2000-5000 cycles with 80-90% usable capacity. Weighs 60% less than lead-acid, charges at 95% efficiency. ROI proven for operations exceeding 200 cycles annually.
Formula: (Amp draw × Runtime hours) ÷ Depth of discharge × 1.2 aging factor. A golf cart drawing 100Ah needs 200Ah flooded capacity (50% DoD) or 125Ah lithium capacity (80% DoD).
Cold temperatures reduce capacity by 1% per degree below 77°F. At 30°F, you lose 47% capacity. Size your bank for coldest operating conditions or use insulated compartments maintaining 50°F temperatures.
Sergey Fedorov, CTO
Series connection: Four 8V batteries create 32V (36V system), six batteries make 48V. Use 2/0 AWG cables for 100-amp loads to limit voltage drop below 0.5V.
Parallel connection: Two 8V 170Ah batteries in parallel deliver 8V 340Ah. Always use equal-length cables to positive/negative bus bars preventing current imbalance and uneven aging.
Flooded batteries: Bulk charge at 9.0-9.3V for 4-6 hours, absorption phase 2-3 hours, float at 8.6-8.8V. Critical—equalize at 9.6-9.8V every 10-30 cycles for 25-30% longer life.
⚡ Never skip equalization on flooded batteries. This controlled overcharge breaks down sulfation and remixes electrolyte, preventing premature failure. US Battery testing proves 25-30% cycle life extension.
AGM batteries: Bulk at 9.0-9.1V, never equalize (damages sealed construction), float at 8.5-8.7V.
Lithium batteries: Charge to 9.2-9.4V with BMS-managed cell balancing. Use lithium-specific chargers—lead-acid equalization algorithms trigger protective shutdowns.
Trojan and US Battery deliver true rated capacity and 800-1200 cycles. Economy brands cost 30-50% less but provide only 60-75% of nameplate capacity with 400-650 cycle life—poor value for commercial operations.
Demand multi-rate discharge test data. Premium batteries maintain capacity across 5-hour, 10-hour, and 20-hour rates. Economy 170Ah batteries often deliver just 100-120Ah at typical golf cart discharge rates—a 30-40% shortfall.
Sergey Fedorov, CTO
🏌️ Golf Carts (Daily Use): Premium flooded 8V batteries. Maintenance staff available, predictable cycles. Cost: $0.28-0.35 per cycle over 5-6 years.
🏭 Floor Scrubbers & Enclosed Equipment: AGM 8V batteries. Limited ventilation, difficult access. Zero maintenance offsets 25-35% price premium.
Lithium justifies premium pricing for: Weight-critical applications (60-70% reduction), high-cycle operations (250 annual cycles), opportunity charging scenarios (95% charge efficiency cuts electricity costs).
Flooded scenario (300 cycles/year): $260 per battery × 6 = $1,560 initial. Replacement at year 3.3 ($1,560). Maintenance $140/year charging losses $65/year = $1,230 over 6 years. Total: $4,350
Lithium scenario: $950 per battery × 6 = $5,700 initial. No replacement needed. Minimal charging losses $25/year = $150 over 6 years. Total: $5,850
💰 Break-even at year 7: Flooded reaches $6,760 (third replacement), lithium stays at $6,100. Every additional year increases lithium ROI advantage.
Lead-acid loses 1% capacity per degree below 77°F. At 30°F, a 170Ah battery delivers only 120Ah (30% loss). Cold batteries also show 0.3-0.5V lower voltage under load, triggering early low-voltage cutoffs.
❄️ Cold solution: Battery blankets or insulated compartments maintaining 40°F preserve 85-90% capacity.
🔋 Lithium advantage: Retains 85-90% capacity at 30°F where lead-acid drops to 70%.
🔥 Heat damage: Life halves every 15°F above 77°F. At 105°F, expect only 400-500 cycles vs 900-1100 normally.
Critical: Reduce charging voltage -0.03V per 10°F above 77°F to prevent overcharge. A 9.2V charger should drop to 9.11V at 107°F. Use temperature-compensated chargers with probe sensors for automatic adjustment.
Replace when capacity drops to 80% of original rating or runtime no longer meets operational needs. For golf carts, this typically occurs after 800-1000 cycles (3-5 years for flooded). Monitor voltage under load—more than 0.5V difference between units indicates replacement needed.
Never mix brands, ages, or chemistry types. Different internal resistance and capacity cause current imbalance—stronger batteries carry excess load while weaker units undercharge. Always replace entire banks simultaneously with identical batteries from the same manufacturing batch.
Common causes: chronic undercharging (sulfation), overcharging (grid corrosion), excessive depth of discharge, extreme temperatures, inadequate maintenance. Proper charging parameters, regular equalization for flooded types, and maintained electrolyte levels extend life significantly.
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