forum threadpennysave posted Aug 13, 2025 05:57 AM
Item 1 of 2
Item 1 of 2
forum threadpennysave posted Aug 13, 2025 05:57 AM
$100: Schumacher 150A Electric Manual Battery Charger & Engine Starter
$100
$186
46% offAmazon
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This unit is rated at 150A @ 12VDC, or 1800W. To meet this rating, you'll need to connect the unit to a 15A house breaker, and hope that the AC to DC converter inside the unit is 100% efficient. In summary, this is BS advertising.
To avoid damage to an old battery that cannot run the starter motor, add distilled water to the correct level. Charge the battery for at least one day between 2-5A @ 12VDC and hope that the battery will hold the charge. Most battery maintainer can deliver this current. No need to spend more on a bigger battery charger.
Modern alternators are not designed to charge a dead battery or maintain a weak battery over a long period of time. Clean the battery posts, battery terminals, ground, and alternator terminals. Replace the battery if the remaining power is less than 40% (free load test at Autozone). A $70 Wal Mart battery is cheap compared to several hundreds for an OEM alternator.
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