The Crown RR5220 45 is a 36V lead-acid forklift battery delivering 620Ah capacity via 18 cells wired in series. Designed for Class III Crown equipment, it powers electric pallet jacks and stackers for 6–8 hours per charge. Electrolyte levels, regular equalization, and temperature-controlled charging (54.9V cutoff) maximize its 1,500-cycle lifespan.
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What are the technical specifications of the RR5220 45?
The RR5220 45 operates at 36 volts with a 620Ah rating, weighing 1,190 lbs. Its lead-calcium grids reduce water loss, while 18-cell design ensures stable 2V/cell output. Dimensions: 45″L x 19″W x 26″H.
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Built for Crown’s electric material handlers, this battery uses thick lead plates (17mm) to withstand 8-hour shifts. Pro Tip: Maintain electrolyte ¼” above plates to prevent sulfation. For example, a single charge at 54.9V (absorption stage) takes 8 hours but restores 95% capacity. Why does plate thickness matter? Thicker plates resist corrosion from frequent deep discharges. Transitional phases like bulk charging (20A) shift to float (52.8V) after 54.9V peak.
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How does the charging process work?
Charging follows a three-stage CC-CV protocol: bulk (20A current), absorption (54.9V), and float (52.8V). Temperature sensors adjust rates to prevent overheating.
The charger delivers 36V at up to 20A until voltage hits 54.9V, then reduces current while holding voltage. A full charge takes 8–10 hours. Beyond voltage control, Crown’s thermal probes monitor cell temps—exceeding 122°F triggers safety shutdowns. Practically speaking, why is temperature critical? Overheating warps plates, reducing capacity by 20% over 50 cycles. For context, charging this battery is like refueling a gas engine: rapid energy transfer initially, then slowing to avoid overflow.
| Charger Type | Current Output | Charge Time |
|---|---|---|
| Crown OEM | 20A | 8–10h |
| Generic 30A | 30A | 6h (risk of plate damage) |
What maintenance extends its lifespan?
Key practices include weekly electrolyte checks, monthly equalization, and post-charge watering to prevent stratification.
Watering must occur after charging when electrolyte expansion is lowest. Equalization every 30 cycles (64.8V for 2 hours) dissolves sulfate buildup. For example, neglecting equalization reduces capacity by 15% annually—akin to skipping oil changes in a truck. But how often should terminals be cleaned? Every 60 days with baking soda to prevent resistance spikes. Transitional maintenance phases matter: post-discharge cooldown (30 mins) before charging minimizes thermal stress.
How does it compare to lithium-ion alternatives?
Lead-acid RR5220 45 offers lower upfront cost ($2,800 vs. $8k for lithium) but requires more maintenance. Lithium-ion suits multi-shift operations with rapid charging.
While lithium batteries recharge in 2 hours and last 3,000 cycles, they’re incompatible with older Crown lift trucks lacking Li-ion voltage regulation. Think of it as diesel vs. electric vehicles: lead-acid is reliable but labor-intensive, whereas lithium is pricier but low-effort. Why choose lead-acid? Budget constraints and existing infrastructure.
| Feature | RR5220 45 (Lead-Acid) | Li-ion Crown |
|---|---|---|
| Cycle Life | 1,500 | 3,000 |
| Charge Time | 8h | 2h |
| Maintenance | Weekly | None |
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FAQs
Check weekly—top up with distilled water if levels are below plate tops. Post-charge watering prevents overflow.
Can this battery power non-Crown equipment?
Yes, if voltage and tray dimensions match. Verify terminal polarity and capacity needs align.
What’s the lifespan in cold storage?
3–4 years (vs. 5–6 in room temp). Cold thickens electrolyte, requiring monthly equalization.
Is partial charging harmful?
Yes—repeated 50% discharges cause stratification. Always charge fully to 54.9V.
