Wirthco
Wirthco Battery Doctor Top Mount Compact Battery Disconnect Switch with 15A Fused Bypass, 500 Surge / 125 Continuous at 12 Volts, Negative Top Post, Green Knob (20309)
Wirthco Battery Doctor Top Mount Compact Battery Disconnect Switch with 15A Fused Bypass, 500 Surge / 125 Continuous at 12 Volts, Negative Top Post, Green Knob (20309)
SKU:W4820309
In stock
Couldn't load pickup availability
- Free shipping on $70+
- Ships from US warehouse
- 30-day returns
The Wirthco 20309 is a battery doctor top mount compact battery.
Key features
- One-Turn Battery Disconnect: Cut power to your vehicle by unscrewing the green knob a few turns to prevent battery drain during storage, then retighten to reconnect without any tools.
- 15 Amp Fused Bypass: Integrated bypass circuit keeps low-draw electronics powered while the main battery is disconnected, maintaining computer settings, radio presets, and clock memory.
- Top Post Installation: Installs directly on the negative battery top post only, and the compact body is sized to fit most battery compartments under the hood.
- Heavy-Duty Power Handling: Rated 500 surge and 125 continuous at 12 volts to handle normal starting and accessory loads on cars, trucks, RVs, boats, and powersports vehicles.
- Theft Deterrent Knob: The green knob can be unscrewed completely and removed to discourage unauthorized use, and the retail package includes Battery Terminal Markers for clean polarity identification.
Before you order
- Check the group size, terminal layout and cold-cranking amps against your current battery.
- Compare the connector and the part number on your old part before ordering.
Specifications
| Brand | Wirthco |
|---|---|
| Manufacturer part number | 20309 |
| Part type | Electronic Switch |
| UPC / GTIN | 10054203098 |
| Weight | 0.50 lb |
| Dimensions (L × W × H) | 0.4 × 0.4 × 0.2 in |
| Category | Electronics & Audio |
| Condition | New |
| Returns | 30-day returns on unused items |
Questions
What does shipping cost?
Standard shipping is free on orders of $70 or more to the lower 48 states and DC, and $8 below that. Express is $15 at checkout. Orders ship the same business day when placed early in the day, otherwise the next business day; standard delivery takes 3–5 business days. Alaska and Hawaii are charged by weight at checkout.
Can I return it?
Yes — unused items in the original packaging can be returned within 30 days of delivery. A restocking fee may apply; see our refund policy.
Shipping & delivery
Shipping & delivery
Free standard shipping on orders of $70 or more to the lower 48 states and DC; $8 on smaller orders. Express is $15 at checkout; Alaska and Hawaii are charged by weight. Orders ship from the warehouse closest to you — the same business day, or the next business day if ordered late in the day, on a weekend or holiday. Standard delivery takes 3–5 business days. Oversized items (bumpers, running boards, large tonneau covers, some marine equipment) ship LTL freight — we contact you to schedule delivery and a signature is required.
Returns & warranty
Returns & warranty
Unused, uninstalled parts in original packaging can be returned within 30 days of delivery. A restocking fee of up to 20% may apply depending on the product, and return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Items marked Final sale can't be returned. If a part fails, contact us with your order number and we'll help with the manufacturer's warranty claim.
Fitment & part numbers
Fitment & part numbers
Verify fitment with the manufacturer part number shown above and your vehicle’s year, make, model and trim. If the listing says “Fits select…”, confirm your exact application before ordering. Not sure? Send us your VIN and the part number and we’ll check it for you.
