A low cost maintainer for keeping a stored car, motorcycle or mower battery topped up. It is too slow to rescue a flat car battery quickly.
Amazon $22.30
The classic set and forget maintainer for lead acid batteries in stored motorcycles, mowers and summer cars. Skip it for lithium batteries or for recharging flat car batteries.
- 0.75 ACharge current
- 12 VVoltage
- NoLithium mode
- 5 yearsWarranty
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
- Keeps a stored motorcycle, mower or classic car battery topped up for months without overcharging
- Five year warranty is long for a maintainer this cheap
- Small enough to tuck into a saddlebag or under a seat
- 750 mA cannot meaningfully recharge a flat car battery
- No lithium setting, so it is wrong for powersport lithium batteries
- No recovery mode for deeply drained batteries
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its current. How we rank explains each one.
Specifications
| Model number | 021-0123 |
|---|---|
| Charging | |
| Charge current | 0.75 A |
| Voltage | 12 V |
| Largest battery | 30 Ah |
| Lithium mode | No |
| AGM mode | No |
| Temperature compensation | Yes |
| Repair mode | No |
| Power supply mode | No |
| Build | |
| Weight | 0.7 lb |
| Warranty | 5 years |
Alternatives in this current
A long lived maintainer for lead acid car and truck batteries in storage, backed by a ten year warranty. Buyers who also need lithium support or faster charging should look elsewhere.
Amazon $58.95A tidy, wall mountable maintainer for a stored lithium or AGM battery, best for buyers who value the OPTIMA warranty over price.
Amazon $114.99Compare
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