FJC 45115 500 Amp vs TOPDC BT-501 500 Amp

Last updated: November 9, 2026

The FJC 45115 500 Amp is the better car battery tester overall, rated 3.3 to 3.1. The FJC 45115 500 Amp leads on system tests. The TOPDC BT-501 500 Amp wins on battery coverage. The FJC 45115 500 Amp costs $20.79 less ($115.20 vs $135.99).

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.

FJC 45115 500 Amp vs TOPDC BT-501 500 Amp

Which should you buy?

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 weightFJC 45115 500 AmpTOPDC BT-501 500 Amp
Overall rating3.3/53.1/5
Price 25%64 $115.2057 $135.99
Battery coverage 25%17 up to 1,000 CCA37 up to 1,000 CCA, 6 V batteries
System tests 20%80 tests the starter, charging system40 tests the charging system
Features or load 20%70 500 A load70 500 A load
Warranty 10%0 warranty not published, scored as none0 warranty not published, scored as none

Specifications

FJC 45115 500 AmpTOPDC BT-501 500 Amp
Testing
TypeCarbon pileCarbon pile
Battery voltages12 V6/12 V
System voltages-12 V
Rating rangeup to 1,000 CCAup to 1,000 CCA
Load current500 A500 A
Starter testYes-
Charging system testYesYes
Features
Display-Analog

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