What to know about Battery Tender 021-0123
Why it stands out
Why we like it
What to know
Score breakdown
How safely and reliably it holds a battery at full charge for months: automatic float/pulse maintenance, overcharge protection, temperature compensation, behavior after power loss, ability to restart on low batteries.
Supported voltages (6V/12V), chemistries (flooded, AGM, gel, LiFePO4), and rated battery capacity relative to the vehicles people store (motorcycles to trucks/RVs).
Set-and-forget operation, clarity of status LEDs/display, lead length, ring-terminal/quick-disconnect harness, mounting.
Build quality, IP rating, rated low operating temperature for unheated garages, warranty length and reported failure rates.
Third-party electrical safety marks (UL/ETL), spark-proof and reverse-polarity protection, CEC/DOE efficiency compliance (maintenance-mode draw), recall history.
Price relative to capability, warranty and the battery sizes it can serve.
Battery Tender 021-0123 specs
Charging
- Max charge current
- 0.75 A
- Charging banks
- 1 banks
- Charges deeply discharged (<1V) batteries
- No
Compatibility
- Battery voltages
- 12V
- Battery chemistries
- Flooded, AGM, gel lead-acid
- Lithium (LiFePO4) mode
- No
Build
- Warranty
- 5 years
- Power source
- AC wall outlet
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Prices and availability may change. The retailer's price and availability at checkout govern the transaction.
| Retailer | Price | Availability | |
|---|---|---|---|
| AmazonLowest | $37.95 $44.95 | In Stock | View deal |
Based on 5 retailer price observations captured during the last 90 days.