FJC 45115 500 Amp
#2 in Load testersFull review
A plain 500 A carbon-pile tester for 12 V batteries up to 1,000 CCA at a lower price than the Solar 1874.
Amazon $115.20$115.20
The FJC 45115 500 Amp is the better car battery tester overall, rated 3.3 to 2.8. The FJC 45115 500 Amp leads on features or load. The OTC 3181 130 Amp wins on price. The OTC 3181 130 Amp costs $25.83 less ($89.37 vs $115.20).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
OTC 3181 130 Amp
#6 in Load testersFull review
A rugged fixed-load tester for quick pass or fail checks on 6 V and 12 V batteries, including side-post ones.
Amazon $89.37$89.37
Which should you buy?
- Choose the FJC 45115 500 Amp for features or load (500 A load vs 130 A load).
- Choose the OTC 3181 130 Amp for price ($89.37 vs $115.20).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every load testers car battery tester; a clear win is highlighted. How we rank explains each one.
| Factor weight | FJC 45115 500 Amp | OTC 3181 130 Amp |
|---|---|---|
| Overall rating | 3.3/5 | 2.8/5 |
| Price 25% | 64 $115.20 | 75 $89.37 |
| Battery coverage 25% | 17 up to 1,000 CCA | 20 CCA range not published, scored as the bottom of the scale, 6 V batteries |
| System tests 20% | 80 tests the starter, charging system | 50 system tests not published (neutral score used) |
| Features or load 20% | 70 500 A load | 11 130 A load |
| Warranty 10% | 0 warranty not published, scored as none | 0 1-year warranty |
Specifications
| FJC 45115 500 Amp | OTC 3181 130 Amp | |
|---|---|---|
| Testing | ||
| Type | Carbon pile | Fixed load |
| Battery voltages | 12 V | 6/12 V |
| Rating range | up to 1,000 CCA | - |
| Load current | 500 A | 130 A |
| Starter test | Yes | - |
| Charging system test | Yes | - |
| Features | ||
| Display | - | Analog |
| Build | ||
| Warranty | - | 1 year |