Hybrid NiMH Battery Test

sanyo-eneloop

Sanyo/Panasonic Eneloop Cells

Receiving a set of NiCad batteries as a 10 year old (for use in a ‘Knight Rider’ RC car – how awesome was that?!) started a lifelong obsession with rechargeable cells.  My interest in batteries started even earlier than this, after being given random lengths of wire, torch bulbs and supposedly dead C cells to ‘play’ with.  Well, it kept me quiet 🙂

maha-charger

Maha/Powerex Smart Charger

Some 35 years later and I’m still doing much the same, only with NiMH cells and a Maha MH-C9000 intelligent charger/analyser.

Recently, I’ve switched to so called ‘hybrid’ cells as whilst the capacities are lower, I find the low self discharge rate to be more beneficial in the long term.

 

All cells are new and run through a charge (0.5C) and discharge (500mA) cycle.
Capacities are expected to marginally improve over several cycles.

AA Hybrid

Brand Type Rated mAh Measured mAh
Sanyo Eneloop Pro (black) 2400 2386
Sanyo Eneloop (white) 1900 1858
Maplin Hybrid 2100 2101
Energizer ACCU Recharge Extreme 2300 2075
Tesco Hybrid 2000 1880
7 Day Shop Good To Go 2150 2220
Duracell Duralock 1300 1345

AAA Hybrid

Brand Type Rated mAh Measured mAh
Sayno Eneloop (white) 750 726
Energizer ACCU Recharge Extreme 800 742

This post will be updated as further brands/types are tested.

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2 Responses to Hybrid NiMH Battery Test

  1. Nick Rapson says:

    Wow, those Tesco hybrids are dire, aren’t they?

    Question, though. Why are the capacities expected to improve over cycles?

  2. m0spn says:

    I’ve re-tested a set of four Tesco Hybrids and the results are much more in line with expectations; I have no idea what happened the first time! The results in the table above have been updated to reflect the new result.

    Also, I can’t find a technical explanation but it often seems that battery capacity will increase after the first few cycles. I assume it’s because the batteries have been idle in their packaging for months (potentially years?) and a few cycles has a positive effect on the battery chemistry. However, I’m no chemist and my google-fu is currently failing me 🙁

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