For the 2019 Forest River Forester TS, start by consulting the owner’s manual to identify required battery specifications for primary and auxiliary systems. Most RV applications require deep-cycle lead-acid or lithium-ion batteries, with typical capacities ranging from 100-200Ah. Check existing battery compartment dimensions (common sizes: Group 24/27/31) and terminal types before purchasing replacements.
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What battery types suit the Forester TS?
The Forester TS typically uses deep-cycle AGM or LiFePO4 batteries for house systems. AGM provides budget-friendly reliability (400-800 cycles), while lithium offers 3,000+ cycles with 50% weight reduction. Verify existing charging system compatibility before upgrading to lithium.
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Forester TS power systems generally operate on 12V DC, requiring batteries with 800-1,500 CCA (cranking) or 100-300Ah (house). Pro Tip: Use voltage testers monthly—house batteries should maintain ≥12.4V (50% charge). For example, Battle Born 100Ah LiFePO4 batteries deliver 1280Wh capacity, powering lights and appliances for 2-3 days off-grid. Always check battery compartment clearance (standard 13″L x 6.8″W x 8.9″H for Group 24).
Where to source compatible batteries?
Purchase from RV specialty stores or certified dealers carrying Renogy, Battle Born, or VMAXTANKS. Online marketplaces require verifying exact dimensions and terminal placements. Local auto shops often stock Group 24/27 sizes but may lack high-capacity lithium options.
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Key suppliers include Camping World (AGM/LiFePO4) and Battery Mart (budget lead-acid). When ordering online, confirm return policies for incorrect fits. For instance, a user successfully installed two VMAX V35-857 (35Ah AGM) batteries in their 2019 Forester TS generator compartment. Pro Tip: Bring old battery photos showing terminals and venting layout when shopping in-store.
| Supplier | Battery Type | Price Range |
|---|---|---|
| Camping World | LiFePO4 | $900-$1,500 |
| Walmart | Lead-Acid | $120-$250 |
How to test existing battery health?
Use a digital load tester or multimeter—healthy batteries show 12.6V+ (12V systems) when idle. Perform load tests at 50% discharge: voltage shouldn’t drop below 11.8V under 25A draw. Hydrometer checks apply only to flooded lead-acid types.
For accurate diagnostics, monitor voltage during appliance use—rapid drops below 12V indicate sulfation. Example: A Forester TS owner discovered their 2019 chassis battery failed due to parasitic fridge draw draining it to 9.8V. Pro Tip: Install battery monitors like Victron BMV-712 to track real-time SOC and health metrics.
How to install replacement batteries?
Disconnect negative terminals first using 10mm wrench. Remove mounting brackets, then lift batteries (AGMs weigh 50-70lbs). Position new units with matching polarity, securing against vibration with OEM trays. Reconnect terminals with anti-corrosion gel.
Lithium installations require additional steps: enable lithium charging profiles on inverters and disable equalization cycles. For example, converting to Battle Born 100Ah batteries in a 2019 Forester TS needed rewiring the WFCO converter’s dip switches. Remember: Lithium batteries don’t vent gas, so sealed compartments are safe. Pro Tip: Apply dielectric grease to terminals—prevents 80% of connection failures.
| Step | Tool | Time |
|---|---|---|
| Terminal Removal | Adjustable Wrench | 5 mins |
| Bracket Release | Socket Set | 10 mins |
Redway Battery Expert Insight
FAQs
Only temporarily—marine batteries lack deep-cycle endurance for RV house systems. Continuous 50% discharges damage their thinner plates within 150 cycles.
What’s the lifespan of OEM Forester TS batteries?
Original lead-acid units typically last 3-5 years with proper maintenance. Lithium replacements extend this to 8-12 years under normal cycling conditions.
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