forum thread Posted by Navy-Wife | Staff • 3d ago
Jul 14, 2025 3:51 PM
Item 1 of 6
Item 1 of 6
forum thread Posted by Navy-Wife | Staff • 3d ago
Jul 14, 2025 3:51 PM
6000A Acmount Car Battery Jump Starter & 26800mAh Power Bank $33 + Free Shipping
$33
$100
67% offAmazon
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Business Name: Shenzhen Zhiying Jishu youxian gongsi
Business Address:
深圳市龙华区民治街道新牛社区民治大道1079号展滔科技大厦C座616
深圳市
龙华区
广东省
518131
CN
Business Name: Shenzhen Zhiying Jishu youxian gongsi
Business Address:
深圳市龙华区民治街道新牛社区民治大道1079号展滔科技大厦C座616
深圳市
龙华区
广东省
518131
CN
Does this make it high quality? What does this mean?
Absolutely
It means the seller is Chinese
18W USB C (5V 2A or 9V 2A)
12W USB A (5V 2.1A)
22.5W USBA (ambiguous: 1 5V 2.4A or 9V 2A or 15V 1.5A, unsure about the space in the first number. it's likely the 1 isn't supposed to be there)
No mention of how fast the device itself charges.
Red flags (I'm no expert, but these make me think about whether it's good quality or not and what the warranty actually is):
- warranty is 3 years, warranty is 24 months.
- *Lots* of spelling mistakes.
- Improbable features (high/low temperature protection? Doubtful. I also doubt the 24 month standby; it's possible but seems unlikely for the price point, longevity, and recommended storage conditions (40% charge) for a probably-lithium battery)
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Business Name: Shenzhen Zhiying Jishu youxian gongsi
Business Address:
深圳市龙华区民治街道新牛社区民治大道1079号展滔科技大厦C座616
深圳市
龙华区
广东省
518131
CN
Everything you buy is made in China or has a Chinese part. Not sure what's the point you are trying to make? Amazon is just Chinese products with 5x the price with Amazon shipping label. Still comes from China. 🙄🙄🙄
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Based on extensive testing, most of these devices only deliver about one-third of their advertised capacity. In reality, you're likely getting around 12,000 to 16,000mAh of usable energy.
High amp ratings like "1500A peak" are common, but they don't tell the full story unless:
- The boost circuit is well-designed,
- The battery cells can sustain high discharge current,
- The wiring and connectors are thick and efficient.
My 3.0L German diesel engine requires approximately 800 amps for 3 seconds during startup.
Power Calculation: 12V × 800A × (3 sec / 3600 sec) ≈ 8 Wh
So, a single crank uses about 8 watt-hours. If your jump starter is rated at 30Wh, you'll get maybe 2–3 cranks total, especially after accounting for energy lost during voltage conversion.
- Cheaper units lose 20–25% energy in the process.
- High-quality brands like NOCO typically lose 15–20%.
How to Accurately Test a Jump Starter:
1. Charge the jump starter to 100%. Use a USB power meter to ensure it's no longer drawing current.
2. Discharge it completely and record the watt-hours (Discharge Wh).
3. Calculate actual capacity in mAh: Real Capacity (mAh) = Discharge Wh ÷ 3.7V
4. Charge the device back to 100% and record the input watt-hours (Input Wh).
5. Calculate energy loss: Loss Wh = (Input Wh - Discharge Wh)
6. Calculate efficiency: Efficiency % = 100 - (Loss Wh ÷ Input Wh × 100)
I bought the Bookoo a week ago. Doesn't compare to my Gooloo but it's also 4x the price
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