Garmin Astro 220 Replacement Battery 3.7V 2200mAh

Garmin Astro 220 / Astro 320 — 3.7V Li-ion Replacement Battery (010-10806-00)

This 3.7V, 2200mAh Li-ion battery replaces the OEM pack in the Garmin Astro 220, Astro 320, and DC20/DC30 dog collar tracking units. It also covers additional collar variants sharing the same connector and BMS handshake. Capacity figures are taken directly from product data, not web estimates.

• Astro 220, 320, DC20, DC30 collar platform: These collars share the same 3.7V cell format, connector pinout, and BMS communication protocol. One replacement pack covers the full Astro collar family without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the Astro collar platform. The BMS accepted the cell without error flags, and the charge circuit terminated correctly at full capacity — no forced cutoff or fault codes observed.
• First GPS fix after battery swap: After installing a new pack, take the dog outside immediately and allow 5–10 minutes for the first GPS acquisition. Power interruption forces a cold start — the collar rebuilds its satellite almanac from scratch, which takes longer than a warm-start update on an established pack.

Collar battery draining faster in rural or low-signal terrain

In areas with weak GPS satellite geometry or heavy tree canopy, the Astro collar's receiver runs at higher duty cycles trying to maintain a fix. This increases current draw well above the baseline you'd see in open fields. The collar also retransmits position data more aggressively when the handheld unit loses contact. If battery life drops noticeably on hunts in dense cover, that's the cause — not a fault with the cell itself.

Collar powers on but handheld unit shows no position update

After a battery swap, the collar restarts its radio and GPS modules from a cold state. The handheld may show the collar as paired but display a stale or missing position until the collar acquires a fresh GPS fix outdoors. This is not a pairing failure — the RF link between collar and handheld is still active. Walk outside with both units and wait for the collar's GPS LED to confirm a fix; the handheld map should update within 10 minutes.