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This is a voltage-sensitive relay (VSR) that automatically connects and disconnects an auxiliary battery to a vehicle's charging system, protecting the starting battery from being drained. It handles up to 140A and supports both lead-acid and lithium chemistries, with an LCD screen and manual/automatic modes for monitoring and control. Compared with simpler isolators, the built-in display and chemistry flexibility are its main advantages, but it is an unbranded unit with no track record. It suits DIYers adding a second battery for camping, off-roading, or marine use.
In stockSold by GUANXUReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Availability unknown
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Lowest price we've seen: $20.79 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
This dual battery isolator is a 12V, 140A voltage sensitive relay (model VSR003). It separates the main starting battery from the auxiliary battery, so running accessories does not drain the starting power.
It has manual and automatic operating modes and an LCD screen for monitoring and control of a DC 12V electrical setup. It supports both lithium and lead-acid batteries.
The housing is made of PA6 material and measures 3.1 x 2.8 x 2.4 inches. It is intended for cars, trucks, RVs, UTVs, ATVs and marine boats.
