TOPDC BT-501 500 Amp
#4 in Load testersFull review
An adjustable 500 A carbon-pile tester with a built-in test timer, for car, truck and farm batteries.
Amazon $135.99$135.99
Carbon pileup to 1,000 CCA12 V
2.8/5
A rugged fixed-load tester for quick pass or fail checks on 6 V and 12 V batteries, including side-post ones.
- Fixed loadType
Check price at Amazon$89.37
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 130 A load gives a result in about 10 seconds
- Clamps grip both top-post and side-post batteries
- Hangs on a wall or toolbox
Cons
- Listing gives no CCA rating limit
- Listing does not describe starter or charging tests
The OTC 130 A load tester family
Every OTC 130 A load tester model we rank, smallest first. Ratings compare each against its own type.
| Model | Type | Rating | Price |
|---|---|---|---|
| OTC 3181 130 Amp (this one) | Fixed load | 2.8/5 | $89.37 |
| OTC 3182 Digital 130 Amp | Fixed load | 2.5/5 | $187.32 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | 3181 |
|---|---|
| Testing | |
| Type | Fixed load |
| Battery voltages | 6/12 V |
| Load current | 130 A |
| Features | |
| Display | Analog |
| Build | |
| Warranty | 1 year |
Alternatives in this type
Schumacher BT-100
#5 in Load testersFull review
A classic, low-cost load tester for checking 6 V and 12 V batteries under a real load.
Amazon $54.99$54.99
Fixed load6/12 V
OTC 3182 Digital 130 Amp
#7 in Load testersFull review
The digital-readout version of OTC’s 130 A load tester, for shops that want an exact number instead of a needle.
Amazon $187.32$187.32
Fixed load
Compare
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