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The Axial Capra’s stock battery tray is tight, so the packs that actually work well are 3S (11.1V) LiPo batteries in the 1300-1550mAh range with an IC5-style connector — not just any 3S pack that happens to be labeled the right voltage.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Spektrum 11.1V 1300mAh 3S 30C Smart LiPo (IC3) | $50-$65 | Amazon · eBay |
| 2 | GOLDBAT 1500mAh 3S LiPo | $18-$28 | Amazon · eBay |
| 3 | Zeee 1500mAh 3S LiPo | $18-$25 | Amazon · eBay |
| 4 | Glacier 45C 1550mAh 3S LiPo | $20-$30 | Amazon |
The picks, in detail
Spektrum 11.1V 1300mAh 3S 30C Smart LiPo (IC3)
A Spektrum Smart-series pack sized specifically to clear the Capra’s tight stock battery tray without trimming foam.
- 11.1V 3S, 1300mAh, 30C discharge
- Spektrum Smart telemetry via compatible receivers
- IC3 connector
- Compact case dimensions built for tight compartments
- Fits the Capra’s stock tray without modification, unlike many higher-capacity packs
- Smart telemetry warns before a real over-discharge
- 1300mAh gives shorter runtime than the larger packs on this list
- Smart features need a Spektrum-compatible receiver or charger to use fully
GOLDBAT 1500mAh 3S LiPo
A lightweight, roughly 4.6-ounce 1500mAh pack that a lot of Capra owners point to as the size that just fits without a fight.
- 11.1V 3S, 1500mAh
- Compact, lightweight case
- Common hobby-grade connector
- Sized for tight RC crawler trays
- Noticeably lighter than 2S hardcase packs of similar capacity, which matters for a crawler’s balance
- Priced well below the Spektrum Smart pack
- No smart telemetry, so voltage has to be checked manually
- Connector may need an adapter depending on your ESC
Zeee 1500mAh 3S LiPo
Another budget-friendly 1500mAh 3S pack reported to fit the Capra’s compartment and connector setup cleanly.
- 11.1V 3S, 1500mAh
- Hardcase or softcase options
- Widely available connector options
- Competitive discharge rating for crawler use
- One of the cheaper ways to add a spare battery for longer trail sessions
- Widely stocked, easy to find a second pack later
- Build quality reports are more mixed than the Spektrum pack at this price
- No built-in telemetry
Glacier 45C 1550mAh 3S LiPo
A slightly higher-capacity 1550mAh pack offering roughly two hours of trail runtime while still fitting the stock compartment.
- 11.1V 3S, 1550mAh, 45C discharge
- Roughly 2-hour runtime reported for crawler use
- Compact case sizing
- Reasonable discharge rating for a crawler’s demands
- Best runtime-per-charge of the packs on this list
- 45C discharge is more than enough headroom for crawling, not racing, current draw
- Slightly larger than the 1300-1500mAh packs; worth double-checking clearance in your specific tray
- Less brand recognition than Spektrum or GOLDBAT
Buying tips
- The Capra’s stock connector is IC5-style (Spektrum’s system), which mates directly with EC5 connectors — the two are electrically compatible despite different-colored housings, so an EC5 pack works without an adapter.
- Stick to 3S (11.1V) packs in the 1300-1550mAh range for a factory-fit compartment; larger 2S hardcase packs and bigger 3S packs both tend to need trimming foam or won’t close the battery door.
- A crawler doesn’t need a high discharge rating the way a basher or racer does — 30C-45C is plenty, so don’t pay extra for a 100C+ pack you’ll never draw down that fast.
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